Update to kramdown and rouge since Github only supports them

_config.yml

@@ -15,9 +15,14 @@ links:
   - name:         GitHub
     url:          http://github.com/muan
     external:     true
-highlighter:      pygments
 permalink:        pretty
-markdown:         redcarpet
-redcarpet:
-  extensions:
-    - smart
+
+# Jekyll 3 now only supports Kramdown for Markdown
+kramdown:
+  # Use GitHub flavored markdown, including triple backtick fenced code blocks
+  input: GFM
+  # Jekyll 3 and GitHub Pages now only support rouge for syntax highlighting
+  syntax_highlighter: rouge
+  syntax_highlighter_opts:
+    # Use existing pygments syntax highlighting css
+    css_class: 'highlight'