Remove codename information

ericdouglas · ericdouglas · commit f96ec33e986e · 2015-05-20T14:03:36.000-03:00
I think this information is unnecessary, and can confuse the reader in some way.
diff --git a/README.md b/README.md
@@ -1,6 +1,6 @@
 ![ECMAScript 6 Learning](http://i.imgur.com/dgRa9Hm.png)
 
-List of resources to learn **ECMAScript 6!** (codename: **ES2015**)
+List of resources to learn **ECMAScript 6!**
 
 #### [ES6 Specification/Proposals](http://wiki.ecmascript.org/doku.php?id=harmony:proposals&do=backlink)
 
