Merge branch 'rs-update-slack-notifier' into 'master'

Update slack-notifier to ~> 1.2.0

Closes #2826 

See merge request !1533

Gemfile

@@ -163,7 +163,7 @@ gem "gitlab-flowdock-git-hook", "~> 1.0.1"
 gem "gemnasium-gitlab-service", "~> 0.2"
 # Slack integration
-gem "slack-notifier", "~> 1.0.0"
+gem "slack-notifier", "~> 1.2.0"
 # Asana integration
 gem 'asana', '~> 0.0.6'

Gemfile.lock

@@ -672,7 +672,7 @@ GEM
       rack-protection (~> 1.4)
       tilt (>= 1.3, < 3)
     six (0.2.0)
-    slack-notifier (1.0.0)
+    slack-notifier (1.2.1)
     slim (2.0.3)
       temple (~> 0.6.6)
       tilt (>= 1.3.3, < 2.1)
@@ -918,7 +918,7 @@ DEPENDENCIES
   simplecov (~> 0.10.0)
   sinatra (~> 1.4.4)
   six (~> 0.2.0)
-  slack-notifier (~> 1.0.0)
+  slack-notifier (~> 1.2.0)
   slim (~> 2.0.2)
   spinach-rails (~> 0.2.1)
   spring (~> 1.3.6)