Add CDNJS version badge in readme

kennynaoh · web-flow · commit b763eda1e7b2 · 2016-12-14T19:54:02.000+08:00
This will add the badge to show its version on CDNJS and also link to its page on CDNJS!
diff --git a/README.md b/README.md
@@ -1,5 +1,6 @@
 jQuery Fullscreen Plugin
 ========================
+[![CDNJS](https://img.shields.io/cdnjs/v/jquery-fullscreen-plugin.svg)](https://cdnjs.com/libraries/jquery-fullscreen-plugin)
 
 
 Description
