Changes the changelog message for Test Flight

The message that was being used was formatted for markdown, and Test Flight can't render markdown

fastlane/Fastfile

@@ -46,7 +46,8 @@ platform :ios do
 
     pods
 
-    changelog = get_changelog
+    changelog = get_changelog_as_markdown
+    test_flight_changelog = get_changelog_clean
     new_build_number = increment_build_number
     version_number = get_version_number(target: 'CouchTracker')
 
@@ -74,18 +75,24 @@ platform :ios do
     )
 
     upload_to_testflight(
-      changelog: changelog,
+      changelog: test_flight_changelog,
       skip_waiting_for_build_processing: false
     )
   end
 
-  private_lane :get_changelog do
+  private_lane :get_changelog_as_markdown do
     link_to_commit = 'http://github.com/pietrocaselani/CouchTracker/commit/%H'
     log_format = "* %s [view commit](#{link_to_commit})"
     tag = `git describe --tags --abbrev=0`.chomp
     `git log #{tag}...HEAD --pretty=format:"#{log_format}"`.chomp ||= ''
   end
 
+  private_lane :get_changelog_clean do
+    log_format = '* %s'
+    tag = `git describe --tags --abbrev=0`.chomp
+    `git log #{tag}...HEAD --pretty=format:"#{log_format}"`.chomp ||= ''
+  end
+
   private_lane :bump_and_commit do |options|
     new_build_number = options[:build_number]
     changelog = options[:changelog]