Bump uglifier from 4.1.3 to 4.1.19

Bumps [uglifier](https://github.com/lautis/uglifier) from 4.1.3 to 4.1.19.
- [Release notes](https://github.com/lautis/uglifier/releases)
- [Changelog](https://github.com/lautis/uglifier/blob/master/CHANGELOG.md)
- [Commits](https://github.com/lautis/uglifier/compare/v4.1.3...v4.1.19)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile

@@ -49,7 +49,7 @@ gem 'social-share-button', '~> 1.1'
 gem 'sprockets', '~> 3.7.2'
 gem 'turbolinks', '~> 2.5.3'
 gem 'turnout', '~> 2.4.0'
-gem 'uglifier', '~> 4.1.2'
+gem 'uglifier', '~> 4.1.19'
 gem 'unicorn', '~> 5.4.1'
 gem 'whenever', '~> 0.10.0', require: false
 gem 'globalize', '~> 5.0.0'

Gemfile.lock

@@ -465,7 +465,7 @@ GEM
       tilt (>= 1.4, < 3)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    uglifier (4.1.3)
+    uglifier (4.1.19)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.4.0)
     unicorn (5.4.1)
@@ -570,7 +570,7 @@ DEPENDENCIES
   sprockets (~> 3.7.2)
   turbolinks (~> 2.5.3)
   turnout (~> 2.4.0)
-  uglifier (~> 4.1.2)
+  uglifier (~> 4.1.19)
   unicorn (~> 5.4.1)
   web-console (~> 3.3.0)
   whenever (~> 0.10.0)