Merge pull request #762 from github/hubot/kramdown-v2-3-1

Bump kramdown to v2.3.1

Author: jriggins

lib/github-pages/dependencies.rb

@@ -11,7 +11,7 @@ class Dependencies
       "jekyll-sass-converter" => "1.5.2",
 
       # Converters
-      "kramdown" => "2.3.0",
+      "kramdown" => "2.3.1",
       "kramdown-parser-gfm" => "1.1.0",
       "jekyll-commonmark-ghpages" => "0.1.6",