Add downloads to README

Author: whoseoyster

README.md

@@ -5,6 +5,7 @@
 # Unbox AI | Python API Library
 
 [![PyPI Latest Release](https://img.shields.io/pypi/v/unboxapi.svg)](https://pypi.org/project/unboxapi/)
+[![downloads](https://pepy.tech/badge/unboxapi)](https://pepy.tech/project/unboxapi)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![Imports: isort](https://img.shields.io/badge/%20imports-isort-%231674b1?style=flat&labelColor=ef8336)](https://pycqa.github.io/isort/)