Added campaign tracking to link in Github

Author: startupandrew

README.md

@@ -1,6 +1,6 @@
 Firechat.js
 ===========
 
-Simple, extensible chat built on [Firebase](https://firebase.com).
+Simple, extensible chat built on [Firebase](https://www.firebase.com/?utm_source=readme&utm_medium=github&utm_campaign=firechat).
 
 For demos, documentation, and integration instructions, see [http://firebase.github.io/firechat/](http://firebase.github.io/firechat/).