diff --git a/Gemfile b/Gemfile
index a6c2de8..7c33060 100755
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 gemspec
diff --git a/Guardfile b/Guardfile
index bc967df..fe9dfd3 100755
--- a/Guardfile
+++ b/Guardfile
@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 # A guardfile for making Danger Plugins
 # For more info see https://github.com/guard/guard#readme
 
 # To run, use `bundle exec guard`.
 
-guard :rspec, cmd: "bundle exec rspec" do
-  require "guard/rspec/dsl"
+guard :rspec, cmd: 'bundle exec rspec' do
+  require 'guard/rspec/dsl'
   dsl = Guard::RSpec::Dsl.new(self)
 
   # Feel free to open issues for suggestions and improvements
diff --git a/Rakefile b/Rakefile
index 1f5d138..46e4f9e 100755
--- a/Rakefile
+++ b/Rakefile
@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 import 'ext/swiftlint/Rakefile'
 require 'bundler/gem_tasks'
-require "rspec/core/rake_task"
+require 'rspec/core/rake_task'
 
 RSpec::Core::RakeTask.new(:spec)
 
@@ -10,5 +12,4 @@ task :spec do
   Rake::Task['specs'].invoke
 end
 
-task :default => :spec
-
+task default: :spec
diff --git a/bin/danger-swiftlint b/bin/danger-swiftlint
index a1bb3c5..076047b 100755
--- a/bin/danger-swiftlint
+++ b/bin/danger-swiftlint
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 if $PROGRAM_NAME == __FILE__
   $LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
diff --git a/danger-swiftlint.gemspec b/danger-swiftlint.gemspec
index ab115b6..a4c39aa 100755
--- a/danger-swiftlint.gemspec
+++ b/danger-swiftlint.gemspec
@@ -1,4 +1,6 @@
-# coding: utf-8
+
+# frozen_string_literal: true
+
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'version'
@@ -8,15 +10,15 @@ Gem::Specification.new do |spec|
   spec.version       = DangerSwiftlint::VERSION
   spec.authors       = ['Ash Furrow', 'David Grandinetti', 'Orta Therox', 'Thiago Felix', 'Giovanni Lodi']
   spec.email         = ['ash@ashfurrow.com', 'dbgrandi@gmail.com', 'orta.therox@gmail.com', 'thiago@thiagofelix.com', 'gio@mokacoding.com']
-  spec.description   = %q{A Danger plugin for linting Swift with SwiftLint.}
-  spec.summary       = %q{A Danger plugin for linting Swift with SwiftLint.}
+  spec.description   = 'A Danger plugin for linting Swift with SwiftLint.'
+  spec.summary       = 'A Danger plugin for linting Swift with SwiftLint.'
   spec.homepage      = 'https://github.com/ashfurrow/danger-swiftlint'
   spec.license       = 'MIT'
 
-  spec.files         = `git ls-files`.split($/)
+  spec.files         = `git ls-files`.split($INPUT_RECORD_SEPARATOR)
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
-  spec.extensions    = %w(ext/swiftlint/Rakefile)
+  spec.extensions    = %w[ext/swiftlint/Rakefile]
   spec.executables   = ['danger-swiftlint']
 
   spec.add_dependency 'danger'
@@ -27,19 +29,18 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler', '~> 1.3'
 
   #  Testing support
-  spec.add_development_dependency "rspec", '~> 3.4'
+  spec.add_development_dependency 'rspec', '~> 3.4'
 
   # Makes testing easy via `bundle exec guard`
-  spec.add_development_dependency "guard", '~> 2.14'
-  spec.add_development_dependency "guard-rspec", '~> 4.7'
+  spec.add_development_dependency 'guard', '~> 2.14'
+  spec.add_development_dependency 'guard-rspec', '~> 4.7'
 
   # If you want to work on older builds of ruby
-  spec.add_development_dependency "listen", '3.0.7'
+  spec.add_development_dependency 'listen', '3.0.7'
 
   # This gives you the chance to run a REPL inside your test
   # via
   #    binding.pry
   # This will stop test execution and let you inspect the results
-  spec.add_development_dependency "pry"
-
+  spec.add_development_dependency 'pry'
 end
diff --git a/ext/swiftlint/Rakefile b/ext/swiftlint/Rakefile
index 8073b84..2aae6ee 100644
--- a/ext/swiftlint/Rakefile
+++ b/ext/swiftlint/Rakefile
@@ -1,12 +1,13 @@
+# frozen_string_literal: true
+
 require_relative '../../lib/version'
 
 namespace :swiftlint do
-
-  desc "Download and install swiftlint tool"
+  desc 'Download and install swiftlint tool'
   task :install do
-    REPO = "https://github.com/realm/SwiftLint"
-    VERSION = ENV["SWIFTLINT_VERSION"] || DangerSwiftlint::SWIFTLINT_VERSION
-    ASSET = "portable_swiftlint.zip"
+    REPO = 'https://github.com/realm/SwiftLint'
+    VERSION = ENV['SWIFTLINT_VERSION'] || DangerSwiftlint::SWIFTLINT_VERSION
+    ASSET = 'portable_swiftlint.zip'
     URL = "#{REPO}/releases/download/#{VERSION}/#{ASSET}"
     DESTINATION = File.expand_path(File.join(File.dirname(__FILE__), 'bin'))
 
@@ -16,9 +17,8 @@ namespace :swiftlint do
       "curl -s -L #{URL} -o #{ASSET}",
       "unzip -q #{ASSET} -d #{DESTINATION}",
       "rm #{ASSET}"
-    ].join(" && ")
+    ].join(' && ')
   end
-
 end
 
 task default: 'swiftlint:install'
diff --git a/ext/swiftlint/swiftlint.rb b/ext/swiftlint/swiftlint.rb
index 3700df0..31a63f3 100644
--- a/ext/swiftlint/swiftlint.rb
+++ b/ext/swiftlint/swiftlint.rb
@@ -1,15 +1,15 @@
 
+# frozen_string_literal: true
+
 class Swiftlint
-  def initialize(swiftlint_path=nil)
+  def initialize(swiftlint_path = nil)
     @swiftlint_path = swiftlint_path
   end
 
   # Runs swiftlint
-  def run(cmd='lint', additional_swiftlint_args='', options={})
+  def run(cmd = 'lint', additional_swiftlint_args = '', options = {})
     # change pwd before run swiftlint
-    if options.has_key? :pwd
-      Dir.chdir options.delete(:pwd)
-    end
+    Dir.chdir options.delete(:pwd) if options.key? :pwd
 
     # run swiftlint with provided options
     `#{swiftlint_path} #{cmd} #{swiftlint_arguments(options, additional_swiftlint_args)}`
@@ -27,7 +27,7 @@ def is_installed?
 
   # Return swiftlint execution path
   def swiftlint_path
-    @swiftlint_path or default_swiftlint_path
+    @swiftlint_path || default_swiftlint_path
   end
 
   private
@@ -35,10 +35,10 @@ def swiftlint_path
   # Parse options into shell arguments how swift expect it to be
   # more information: https://github.com/Carthage/Commandant
   # @param options (Hash) hash containing swiftlint options
-  def swiftlint_arguments (options, additional_swiftlint_args)
+  def swiftlint_arguments(options, additional_swiftlint_args)
     (options.
       # filter not null
-      select {|key, value| !value.nil?}.
+      reject { |_key, value| value.nil? }.
       # map booleans arguments equal true
       map { |key, value| value.is_a?(TrueClass) ? [key, ''] : [key, value] }.
       # map booleans arguments equal false
@@ -48,7 +48,7 @@ def swiftlint_arguments (options, additional_swiftlint_args)
       # prepend '--' into the argument
       map { |key, value| ["--#{key}", value] }.
       # reduce everything into a single string
-      reduce('') { |args, option| "#{args} #{option[0]} #{option[1]}"} + 
+      reduce('') { |args, option| "#{args} #{option[0]} #{option[1]}" } +
       " #{additional_swiftlint_args}").
       # strip leading spaces
       strip
diff --git a/lib/danger_plugin.rb b/lib/danger_plugin.rb
index acb7269..7c01165 100755
--- a/lib/danger_plugin.rb
+++ b/lib/danger_plugin.rb
@@ -1,10 +1,11 @@
+# frozen_string_literal: true
+
 require 'find'
 require 'yaml'
 require 'shellwords'
 require_relative '../ext/swiftlint/swiftlint'
 
 module Danger
-
   # Lint Swift files inside your projects.
   # This is done using the [SwiftLint](https://github.com/realm/SwiftLint) tool.
   # Results are passed out as a table in markdown.
@@ -39,9 +40,9 @@ class DangerSwiftlint < Plugin
     #          if nil, modified and added files from the diff will be used.
     # @return  [void]
     #
-    def lint_files(files=nil, inline_mode: false, fail_on_error: false, additional_swiftlint_args: "")
+    def lint_files(files = nil, inline_mode: false, fail_on_error: false, additional_swiftlint_args: '')
       # Fails if swiftlint isn't installed
-      raise "swiftlint is not installed" unless swiftlint.is_installed?
+      raise 'swiftlint is not installed' unless swiftlint.is_installed?
 
       config = if config_file
         File.expand_path(config_file)
@@ -51,7 +52,7 @@ def lint_files(files=nil, inline_mode: false, fail_on_error: false, additional_s
         nil
       end
       log "Using config file: #{config}"
-      
+
       dir_selected = directory ? File.expand_path(directory) : Dir.pwd
       log "Swiftlint will be run from #{dir_selected}"
 
@@ -81,19 +82,19 @@ def lint_files(files=nil, inline_mode: false, fail_on_error: false, additional_s
 
       if inline_mode
         # Reprt with inline comment
-        send_inline_comment(warnings, "warn")
-        send_inline_comment(errors, "fail")
+        send_inline_comment(warnings, 'warn')
+        send_inline_comment(errors, 'fail')
       else
         # Report if any warning or error
         if warnings.count > 0 || errors.count > 0
-          message = "### SwiftLint found issues\n\n"
+          message = +"### SwiftLint found issues\n\n"
           message << markdown_issues(warnings, 'Warnings') unless warnings.empty?
           message << markdown_issues(errors, 'Errors') unless errors.empty?
           markdown message
 
           # Fail Danger on errors
-          if fail_on_error && errors.count > 0
-            fail "Failed due to SwiftLint errors"
+          if fail_on_error && errors.count.positive?
+            fail 'Failed due to SwiftLint errors'
           end
         end
       end
@@ -104,8 +105,8 @@ def lint_files(files=nil, inline_mode: false, fail_on_error: false, additional_s
     # @return [Array] swiftlint issues
     def run_swiftlint(files, options, additional_swiftlint_args)
       files
-        .map { |file| options.merge({path: file})}
-        .map { |full_options| swiftlint.lint(full_options, additional_swiftlint_args)}
+        .map { |file| options.merge(path: file) }
+        .map { |full_options| swiftlint.lint(full_options, additional_swiftlint_args) }
         .reject { |s| s == '' }
         .map { |s| JSON.parse(s).flatten }
         .flatten
@@ -115,29 +116,29 @@ def run_swiftlint(files, options, additional_swiftlint_args)
     # If files are not provided it will use git modifield and added files
     #
     # @return [Array] swift files
-    def find_swift_files(files=nil, excluded_paths=[], dir_selected)
+    def find_swift_files(files = nil, excluded_paths = [], dir_selected)
       # Assign files to lint
       files = files ? Dir.glob(files) : (git.modified_files - git.deleted_files) + git.added_files
 
       # Filter files to lint
-      return files.
+      files.
         # Ensure only swift files are selected
         select { |file| file.end_with?('.swift') }.
         # Make sure we don't fail when paths have spaces
         map { |file| Shellwords.escape(file) }.
         # Remove dups
-        uniq.
-        map { |file| File.expand_path(file) }.
+        uniq
+           .map { |file| File.expand_path(file) }.
         # Ensure only files in the selected directory
         select { |file| file.start_with?(dir_selected) }.
         # Reject files excluded on configuration
-        reject { |file|
-          excluded_paths.any? { |excluded_path|
-            Find.find(excluded_path).
-              map { |excluded_file| Shellwords.escape(excluded_file) }.
-              include?(file)
-          }
-        }
+        reject do |file|
+        excluded_paths.any? do |excluded_path|
+          Find.find(excluded_path)
+              .map { |excluded_file| Shellwords.escape(excluded_file) }
+              .include?(file)
+        end
+      end
     end
 
     # Parses the configuration file and return the excluded files
@@ -145,25 +146,25 @@ def find_swift_files(files=nil, excluded_paths=[], dir_selected)
     # @return [Array] list of files excluded
     def excluded_files_from_config(filepath)
       config = if filepath
-        YAML.load_file(filepath)
-      else
-        {"excluded" => []}
+                 YAML.load_file(filepath)
+               else
+                 { 'excluded' => [] }
       end
 
       excluded_paths = config['excluded'] || []
 
       # Extract excluded paths
-      return excluded_paths.
-        map { |path| File.join(File.dirname(filepath), path) }.
-        map { |path| File.expand_path(path) }.
-        select { |path| File.exists?(path) || Dir.exists?(path) }
+      excluded_paths
+        .map { |path| File.join(File.dirname(filepath), path) }
+        .map { |path| File.expand_path(path) }
+        .select { |path| File.exist?(path) || Dir.exist?(path) }
     end
 
     # Create a markdown table from swiftlint issues
     #
     # @return  [String]
-    def markdown_issues (results, heading)
-      message = "#### #{heading}\n\n"
+    def markdown_issues(results, heading)
+      message = +"#### #{heading}\n\n"
 
       message << "File | Line | Reason |\n"
       message << "| --- | ----- | ----- |\n"
@@ -182,11 +183,11 @@ def markdown_issues (results, heading)
     # Send inline comment with danger's warn or fail method
     #
     # @return [void]
-    def send_inline_comment (results, method)
+    def send_inline_comment(results, method)
       dir = "#{Dir.pwd}/"
       results.each do |r|
-      filename = r['file'].gsub(dir, "")
-      send(method, r['reason'], file: filename, line: r['line'])
+        filename = r['file'].gsub(dir, '')
+        send(method, r['reason'], file: filename, line: r['line'])
       end
     end
 
diff --git a/lib/version.rb b/lib/version.rb
index 732a6e1..fcc7bfb 100755
--- a/lib/version.rb
+++ b/lib/version.rb
@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 module DangerSwiftlint
-  VERSION = "0.10.1".freeze
-  SWIFTLINT_VERSION = "0.20.1".freeze
+  VERSION = '0.10.0'
+  SWIFTLINT_VERSION = '0.20.1'
 end
diff --git a/spec/danger_plugin_spec.rb b/spec/danger_plugin_spec.rb
index 32320ba..8acfdb0 100755
--- a/spec/danger_plugin_spec.rb
+++ b/spec/danger_plugin_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require File.expand_path('../spec_helper', __FILE__)
 
 module Danger
@@ -12,9 +14,9 @@ module Danger
         allow(@swiftlint.git).to receive(:deleted_files).and_return([])
       end
 
-      it "handles swiftlint not being installed" do
+      it 'handles swiftlint not being installed' do
         allow_any_instance_of(Swiftlint).to receive(:is_installed?).and_return(false)
-        expect { @swiftlint.lint_files }.to raise_error("swiftlint is not installed")
+        expect { @swiftlint.lint_files }.to raise_error('swiftlint is not installed')
       end
 
       it 'does not markdown an empty message' do
@@ -44,29 +46,29 @@ module Danger
 
         it 'accept files as arguments' do
           expect_any_instance_of(Swiftlint).to receive(:lint)
-            .with(hash_including(:path => File.expand_path('spec/fixtures/SwiftFile.swift')), '')
+            .with(hash_including(path: File.expand_path('spec/fixtures/SwiftFile.swift')), '')
             .and_return(@swiftlint_response)
 
-          @swiftlint.lint_files("spec/fixtures/*.swift")
+          @swiftlint.lint_files('spec/fixtures/*.swift')
 
           output = @swiftlint.status_report[:markdowns].first.to_s
-          expect(output).to include("SwiftLint found issues")
-          expect(output).to include("SwiftFile.swift | 13 | Force casts should be avoided.")
+          expect(output).to include('SwiftLint found issues')
+          expect(output).to include('SwiftFile.swift | 13 | Force casts should be avoided.')
         end
 
         it 'accepts additional cli arguments' do
           expect_any_instance_of(Swiftlint).to receive(:lint)
-            .with(hash_including(:path => File.expand_path('spec/fixtures/SwiftFile.swift')), '--lenient')
+            .with(hash_including(path: File.expand_path('spec/fixtures/SwiftFile.swift')), '--lenient')
             .and_return(@swiftlint_response)
 
-          @swiftlint.lint_files("spec/fixtures/*.swift", additional_swiftlint_args: '--lenient')
+          @swiftlint.lint_files('spec/fixtures/*.swift', additional_swiftlint_args: '--lenient')
         end
 
         it 'uses git diff when files are not provided' do
           allow(@swiftlint.git).to receive(:modified_files).and_return(['spec/fixtures/SwiftFile.swift'])
           allow(@swiftlint.git).to receive(:added_files).and_return([])
           allow_any_instance_of(Swiftlint).to receive(:lint)
-            .with(hash_including(:path => File.expand_path('spec/fixtures/SwiftFile.swift')), '')
+            .with(hash_including(path: File.expand_path('spec/fixtures/SwiftFile.swift')), '')
             .and_return(@swiftlint_response)
 
           @swiftlint.lint_files
@@ -79,29 +81,28 @@ module Danger
           @swiftlint.directory = 'spec/fixtures/some_dir'
 
           allow_any_instance_of(Swiftlint).to receive(:lint)
-            .with(hash_including(:pwd => File.expand_path(@swiftlint.directory)), '')
+            .with(hash_including(pwd: File.expand_path(@swiftlint.directory)), '')
             .and_return(@swiftlint_response)
 
-          @swiftlint.lint_files(["spec/fixtures/some_dir/SwiftFile.swift"])
+          @swiftlint.lint_files(['spec/fixtures/some_dir/SwiftFile.swift'])
 
           output = @swiftlint.status_report[:markdowns].first.to_s
           expect(output).to_not be_empty
-          
         end
 
         it 'only lint files specified in custom dir' do
           @swiftlint.directory = 'spec/fixtures/some_dir'
-        
+
           allow(@swiftlint.git).to receive(:added_files).and_return([])
           allow(@swiftlint.git).to receive(:modified_files).and_return([
-            'spec/fixtures/some_dir/SwiftFile.swift',
-            'spec/fixtures/SwiftFile.swift'
-          ])
+                                                                         'spec/fixtures/some_dir/SwiftFile.swift',
+                                                                         'spec/fixtures/SwiftFile.swift'
+                                                                       ])
 
           expect_any_instance_of(Swiftlint).to receive(:lint)
-          .with(hash_including(:path => File.expand_path('spec/fixtures/some_dir/SwiftFile.swift')), '')
-          .once
-          .and_return(@swiftlint_response)
+            .with(hash_including(path: File.expand_path('spec/fixtures/some_dir/SwiftFile.swift')), '')
+            .once
+            .and_return(@swiftlint_response)
 
           @swiftlint.lint_files
         end
@@ -127,13 +128,13 @@ module Danger
         it 'does not lint files in the excluded paths' do
           allow(@swiftlint.git).to receive(:added_files).and_return([])
           allow(@swiftlint.git).to receive(:modified_files).and_return([
-            'spec/fixtures/SwiftFile.swift',
-            'spec/fixtures/excluded_dir/SwiftFileThatShouldNotBeIncluded.swift',
-            'spec/fixtures/excluded_dir/SwiftFile WithEscaped+CharactersThatShouldNotBeIncluded.swift'
-          ])
+                                                                         'spec/fixtures/SwiftFile.swift',
+                                                                         'spec/fixtures/excluded_dir/SwiftFileThatShouldNotBeIncluded.swift',
+                                                                         'spec/fixtures/excluded_dir/SwiftFile WithEscaped+CharactersThatShouldNotBeIncluded.swift'
+                                                                       ])
 
           expect_any_instance_of(Swiftlint).to receive(:lint)
-            .with(hash_including(:path => File.expand_path('spec/fixtures/SwiftFile.swift')), '')
+            .with(hash_including(path: File.expand_path('spec/fixtures/SwiftFile.swift')), '')
             .once
             .and_return(@swiftlint_response)
 
@@ -144,11 +145,11 @@ module Danger
         it 'does not crash when excluded is nil' do
           allow(@swiftlint.git).to receive(:added_files).and_return([])
           allow(@swiftlint.git).to receive(:modified_files).and_return([
-            'spec/fixtures/SwiftFile.swift',
-          ])
+                                                                         'spec/fixtures/SwiftFile.swift'
+                                                                       ])
 
           expect_any_instance_of(Swiftlint).to receive(:lint)
-            .with(hash_including(:path => File.expand_path('spec/fixtures/SwiftFile.swift')), '')
+            .with(hash_including(path: File.expand_path('spec/fixtures/SwiftFile.swift')), '')
             .once
             .and_return(@swiftlint_response)
 
@@ -208,15 +209,15 @@ module Danger
           # they'd result in file not found errors.
           allow(@swiftlint.git).to receive(:added_files).and_return([])
           allow(@swiftlint.git).to receive(:modified_files).and_return([
-            'spec/fixtures/SwiftFile.swift',
-            'spec/fixtures/DeletedFile.swift'
-          ])
+                                                                         'spec/fixtures/SwiftFile.swift',
+                                                                         'spec/fixtures/DeletedFile.swift'
+                                                                       ])
           allow(@swiftlint.git).to receive(:deleted_files).and_return([
-            'spec/fixtures/DeletedFile.swift'
-          ])
+                                                                        'spec/fixtures/DeletedFile.swift'
+                                                                      ])
 
           expect_any_instance_of(Swiftlint).to receive(:lint)
-            .with(hash_including(:path => File.expand_path('spec/fixtures/SwiftFile.swift')), '')
+            .with(hash_including(path: File.expand_path('spec/fixtures/SwiftFile.swift')), '')
             .once
             .and_return(@swiftlint_response)
 
@@ -225,10 +226,10 @@ module Danger
 
         it 'generates errors instead of markdown when use inline mode' do
           allow_any_instance_of(Swiftlint).to receive(:lint)
-            .with(hash_including(:path => File.expand_path('spec/fixtures/SwiftFile.swift')), '')
+            .with(hash_including(path: File.expand_path('spec/fixtures/SwiftFile.swift')), '')
             .and_return(@swiftlint_response)
 
-          @swiftlint.lint_files("spec/fixtures/*.swift", inline_mode: true, fail_on_error: false, additional_swiftlint_args: '')
+          @swiftlint.lint_files('spec/fixtures/*.swift', inline_mode: true, fail_on_error: false, additional_swiftlint_args: '')
 
           status = @swiftlint.status_report
           expect(status[:errors]).to_not be_empty
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index bebbaf6..c7db4ec 100755
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,16 +1,18 @@
+# frozen_string_literal: true
+
 require 'pathname'
 
 ROOT = Pathname.new(File.expand_path('../../', __FILE__))
-$:.unshift((ROOT + 'lib').to_s)
-$:.unshift((ROOT + 'spec').to_s)
+$LOAD_PATH.unshift((ROOT + 'lib').to_s)
+$LOAD_PATH.unshift((ROOT + 'spec').to_s)
 
 RSpec.configure do |config|
- # Use color in STDOUT
+  # Use color in STDOUT
   config.color = true
 end
 
 RSpec::Matchers.define :including do |x|
-  match { |actual| actual.include? x  }
+  match { |actual| actual.include? x }
 end
 
 require 'bundler/setup'
@@ -32,11 +34,11 @@ def testing_ui
 # running a PR on TravisCI
 def testing_env
   {
-    "HAS_JOSH_K_SEAL_OF_APPROVAL" => "true",
-    "TRAVIS_PULL_REQUEST" => "800",
-    "TRAVIS_REPO_SLUG" => "artsy/eigen",
-    "TRAVIS_COMMIT_RANGE" => "759adcbd0d8f...13c4dc8bb61d",
-    "DANGER_GITHUB_API_TOKEN" => "123sbdq54erfsd3422gdfio"
+    'HAS_JOSH_K_SEAL_OF_APPROVAL' => 'true',
+    'TRAVIS_PULL_REQUEST' => '800',
+    'TRAVIS_REPO_SLUG' => 'artsy/eigen',
+    'TRAVIS_COMMIT_RANGE' => '759adcbd0d8f...13c4dc8bb61d',
+    'DANGER_GITHUB_API_TOKEN' => '123sbdq54erfsd3422gdfio'
   }
 end
 
@@ -44,4 +46,4 @@ def testing_env
 def testing_dangerfile
   env = Danger::EnvironmentManager.new(testing_env)
   Danger::Dangerfile.new(env, testing_ui)
-end
\ No newline at end of file
+end
diff --git a/spec/swiftlint_spec.rb b/spec/swiftlint_spec.rb
index fef9b28..5ed5641 100644
--- a/spec/swiftlint_spec.rb
+++ b/spec/swiftlint_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require File.expand_path('../spec_helper', __FILE__)
 require_relative '../ext/swiftlint/swiftlint'
 
@@ -25,7 +27,7 @@
 
   it 'runs lint by default with options being optional' do
     expect(swiftlint).to receive(:`).with(including('swiftlint lint'))
-    swiftlint.run()
+    swiftlint.run
   end
 
   it 'runs accepting symbolized options' do
@@ -36,8 +38,6 @@
                   '',
                   use_stdin: false,
                   cache_path: '/path',
-                  enable_all_rules: true
-                  )
+                  enable_all_rules: true)
   end
 end
-