Merge branch 'dz-bump-version-sorter' into 'master'

Bump version_sorter to version 2.2.4

See merge request gitlab-org/gitlab-ce!25487

Gemfile

@@ -184,7 +184,7 @@ gem 're2', '~> 1.1.1'
 
 # Misc
 
-gem 'version_sorter', '~> 2.1.0'
+gem 'version_sorter', '~> 2.2.4'
 
 # Export Ruby Regex to Javascript
 gem 'js_regex', '~> 3.1'

Gemfile.lock

@@ -916,7 +916,7 @@ GEM
     validates_hostname (1.0.6)
       activerecord (>= 3.0)
       activesupport (>= 3.0)
-    version_sorter (2.1.0)
+    version_sorter (2.2.4)
     virtus (1.0.5)
       axiom-types (~> 0.1)
       coercible (~> 1.0)
@@ -1172,7 +1172,7 @@ DEPENDENCIES
   unicorn (~> 5.4.1)
   unicorn-worker-killer (~> 0.4.4)
   validates_hostname (~> 1.0.6)
-  version_sorter (~> 2.1.0)
+  version_sorter (~> 2.2.4)
   virtus (~> 1.0.1)
   vmstat (~> 2.3.0)
   webmock (~> 3.5.1)