Adding waffle.io stamp to README

Author: heathermiller

README.md

@@ -1,7 +1,8 @@
 scala/pickling
 ==============
 
-[![Build Status](https://travis-ci.org/scala/pickling.svg?branch=0.9.x)](https://travis-ci.org/scala/pickling.svg?branch=0.9.x)
+[![Build Status](https://travis-ci.org/scala/pickling.svg?branch=0.9.x)](https://travis-ci.org/scala/pickling.svg?branch=0.9.x) 
+[![Stories in Ready](https://badge.waffle.io/scala/pickling.png?label=ready&title=Ready)](http://waffle.io/scala/pickling)
 
 
 **Scala Pickling** is an automatic serialization framework made for Scala. It's fast, boilerplate-free, and allows users to easily swap in/out different serialization formats (such as binary, or JSON), or even to provide your own custom serialization format.