Readme: updating QUnit information

updates QUnit reference site and method naming.

Closes gh-1493
(cherry picked from commit 594687ab)

README.md

@@ -242,7 +242,7 @@ Following are some commands that can be used there:
 * `Ctrl + S` - save
 * `Ctrl + Q` - quit
 
-[QUnit](http://docs.jquery.com/QUnit) Reference
+[QUnit](http://api.qunitjs.com) Reference
 -----------------
 
 ### Test methods ###