add Roger Braun as contributor

README.md

@@ -190,4 +190,6 @@ Credits
       GitHub project maintainer
     * [Remy Sharp](http://remysharp.com/):  
       CommonJS-compatibility and more
+    * [Roger Braun](https://github.com/rogerbraun):  
+      Github-style code blocks
 

package.json

@@ -7,7 +7,8 @@
         "John Fraser",
         "Corey Innis",
         "Remy Sharp",
-        "Konstantin Käfer"
+        "Konstantin Käfer",
+        "Roger Braun",
     ],
     "repository": {
         "type": "git",