chore(readme): fix waffle link

Author: ajoslin

README.md

@@ -1,6 +1,6 @@
 <a href="https://travis-ci.org/driftyco/ionic"><img src="http://img.shields.io/travis/driftyco/ionic.svg?style=flat" data-bindattr-164="164" title="Build Status Images"></a>
 
-![Issues Ready](https://badge.waffle.io/driftyco/ionic.png?label=ready&title=Ready)](https://waffle.io/driftyco/ionic)
+[![Issues Ready](https://badge.waffle.io/driftyco/ionic.png?label=ready&title=Ready)](https://waffle.io/driftyco/ionic)
 
 The best place to start with Ionic is our [documentation page](http://ionicframework.com/docs/).