Add downloads count badge. (#41)

Author: ebram96

README.md

@@ -2,6 +2,7 @@
 
 [![Documentation Status](https://readthedocs.org/projects/abstractapi-python-sdk/badge/?version=latest)](https://abstractapi-python-sdk.readthedocs.io/en/latest/?badge=latest)
 [![PyPI version](https://badge.fury.io/py/abstract-api.svg)](https://badge.fury.io/py/abstract-api)
+[![PyPI Downloads](https://static.pepy.tech/badge/abstract-api)](https://pepy.tech/projects/abstract-api)
 
 This is a simple and intuitive Python SDK for using [AbstractAPI's](https://www.abstractapi.com/) services.