Merge branch 'sh-update-parser' into 'master'

Upgrade parser gem to 2.5.1.2

See merge request gitlab-org/gitlab-ce!22590

Gemfile.lock

@@ -547,7 +547,7 @@ GEM
     orm_adapter (0.5.0)
     os (1.0.0)
     parallel (1.12.1)
-    parser (2.5.1.0)
+    parser (2.5.1.2)
       ast (~> 2.4.0)
     parslet (1.8.2)
     peek (1.0.1)

Gemfile.rails5.lock

@@ -551,7 +551,7 @@ GEM
     orm_adapter (0.5.0)
     os (1.0.0)
     parallel (1.12.1)
-    parser (2.5.1.0)
+    parser (2.5.1.2)
       ast (~> 2.4.0)
     parslet (1.8.2)
     peek (1.0.1)