Fix link to 'Contributing.md' to include file's name in README

Author: bantic

README.md

@@ -133,7 +133,7 @@ you may have luck with another of the runtimes supported by
 
 # Contribution
 
-[See](https://github.com/emberjs/ember.js/blob/master/CONTRIBUTING.md)
+[See `CONTRIBUTING.md`](https://github.com/emberjs/ember.js/blob/master/CONTRIBUTING.md)
 
 # How to Run Unit Tests