Add pypi badge (#233)

README.md

@@ -4,6 +4,7 @@
 [![Build Status](https://api.travis-ci.com/lyft/amundsendatabuilder.svg?branch=master)](https://travis-ci.com/lyft/amundsendatabuilder)
 [![Coverage Status](https://img.shields.io/codecov/c/github/lyft/amundsendatabuilder/master.svg)](https://codecov.io/github/lyft/amundsendatabuilder?branch=master)
 [![License](http://img.shields.io/:license-Apache%202-blue.svg)](LICENSE)
+[![PyPI - Python Version](https://img.shields.io/pypi/pyversions/amundsen-databuilder.svg)](https://pypi.org/project/amundsen-databuilder/)
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)
 [![Slack Status](https://img.shields.io/badge/slack-join_chat-white.svg?logo=slack&style=social)](https://amundsenworkspace.slack.com/join/shared_invite/enQtNTk2ODQ1NDU1NDI0LTc3MzQyZmM0ZGFjNzg5MzY1MzJlZTg4YjQ4YTU0ZmMxYWU2MmVlMzhhY2MzMTc1MDg0MzRjNTA4MzRkMGE0Nzk)
 
@@ -444,4 +445,3 @@ With this pattern RestApiQuery supports 1:1 and 1:N JOIN relationship.
 (GROUP BY or any other aggregation, sub-query join is not supported)  
 
 To see in action, take a peek at [ModeDashboardExtractor](https://github.com/lyft/amundsendatabuilder/blob/master/databuilder/extractor/dashboard/mode_dashboard_extractor.py)
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