version badge added [ci skip]

Author: hootnot

README.md

@@ -1,6 +1,7 @@
 # ReJSON Python Client
 
 [![Build Status](https://travis-ci.org/RedisLabs/rejson-py.svg?branch=master)](https://travis-ci.org/RedisLabs/rejson-py)
+[![Versions](https://img.shields.io/pypi/pyversions/rejson.svg)](https://github.com/RedisLabs/rejson-py)
 
 rejson-py is a package that allows storing, updating and querying objects as
 JSON documents in a [Redis](https://redis.io) database that is extended with the