added badges

Author: pkaeding

README.md

@@ -1,7 +1,10 @@
 LaunchDarkly SDK for Python
 ===========================
 
-![Circle CI](https://circleci.com/gh/launchdarkly/python-client.png)
+[![Circle CI](https://img.shields.io/circleci/project/launchdarkly/python-client.png)](https://circleci.com/gh/launchdarkly/python-client)
+[![PyPI](https://img.shields.io/pypi/v/ldclient-py.svg?maxAge=2592000)](https://pypi.python.org/pypi/ldclient-py)
+[![PyPI](https://img.shields.io/pypi/dm/ldclient-py.svg?maxAge=2592000)](https://pypi.python.org/pypi/ldclient-py)
+[![Twitter Follow](https://img.shields.io/twitter/follow/launchdarkly.svg?style=social&label=Follow&maxAge=2592000)](https://twitter.com/intent/follow?screen_name=launchdarkly)
 
 Quick setup
 -----------