Add PyPi badge

README.md

@@ -2,6 +2,7 @@ Fig
 ===
 
 [![Build Status](https://travis-ci.org/orchardup/fig.png?branch=master)](https://travis-ci.org/orchardup/fig)
+[![PyPI version](https://badge.fury.io/py/fig.png)](http://badge.fury.io/py/fig)
 
 Punctual, lightweight development environments using Docker.