Merge branch 'rouge_3.2.1' into 'master'

Update Rouge to 3.2.1. Includes a critical fix for the Perl Lexer

See merge request gitlab-org/gitlab-ce!21263

Gemfile.lock

@@ -743,7 +743,7 @@ GEM
     retriable (3.1.1)
     rinku (2.0.0)
     rotp (2.1.2)
-    rouge (3.2.0)
+    rouge (3.2.1)
     rqrcode (0.7.0)
       chunky_png
     rqrcode-rails3 (0.1.7)

changelogs/unreleased/rouge_3-2-1.yml

+---
+title: Update to Rouge 3.2.1, which includes a critical fix to the Perl Lexer
+merge_request: 21263
+author:
+type: changed