Bump uglifier from 4.1.18 to 4.2.0

Bumps [uglifier](https://github.com/lautis/uglifier) from 4.1.18 to 4.2.0.
- [Release notes](https://github.com/lautis/uglifier/releases)
- [Changelog](https://github.com/lautis/uglifier/blob/master/CHANGELOG.md)
- [Commits](lautis/uglifier@v4.1.18...v4.2.0)

---
updated-dependencies:
- dependency-name: uglifier
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile

@@ -40,7 +40,7 @@ gem "paranoia"
 ## views
 gem "sass-rails"
 gem "coffee-rails"
-gem "uglifier", "= 4.1.18" # 4.1.19 has an issue https://github.com/mishoo/UglifyJS2/issues/3245
+gem "uglifier", "4.2.0" # 4.1.19 has an issue https://github.com/mishoo/UglifyJS2/issues/3245
 # TO DO: consider using nodejs instead of mini_racer
 # libv8 8+ does not like to compile on our boxes. It's easier to lock down
 # libv8 and mini_racer for now than to try to get them upgraded on the server.

Gemfile.lock

@@ -272,7 +272,7 @@ GEM
     exception_notification (4.4.3)
       actionmailer (>= 4.0, < 7)
       activesupport (>= 4.0, < 7)
-    execjs (2.7.0)
+    execjs (2.8.1)
     eye (0.10.0)
       celluloid (~> 0.17.3)
       celluloid-io (~> 0.17.0)
@@ -549,7 +549,7 @@ GEM
     ttfunk (1.7.0)
     tzinfo (1.2.9)
       thread_safe (~> 0.1)
-    uglifier (4.1.18)
+    uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.7.0)
     unicorn (6.0.0)
@@ -669,7 +669,7 @@ DEPENDENCIES
   synaccess_connect
   teaspoon-jasmine
   text_helpers
-  uglifier (= 4.1.18)
+  uglifier (= 4.2.0)
   unicorn
   vuejs-rails (~> 1.0.26)
   web-console