add badges

Author: gkorland

README.md

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+[![license](https://img.shields.io/github/license/RedisBloom/redisbloom-py.svg)](https://github.com/RedisBloom/redisbloom-py)
+[![PyPI version](https://badge.fury.io/py/redisbloom.svg)](https://badge.fury.io/py/redisbloom)
+[![CircleCI](https://circleci.com/gh/RedisBloom/redisbloom-py/tree/master.svg?style=svg)](https://circleci.com/gh/RedisBloom/redisbloom-py/tree/master)
+[![GitHub issues](https://img.shields.io/github/release/RedisBloom/redisbloom-py.svg)](https://github.com/RedisBloom/redisbloom-py/releases/latest)
+[![Codecov](https://codecov.io/gh/RedisBloom/redisbloom-py/branch/master/graph/badge.svg)](https://codecov.io/gh/RedisBloom/redisbloom-py)
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 # redisbloom-py
 Python client for Redisbloom