Add a downloads/month badge from pypi

README.md

@@ -8,6 +8,7 @@
 # [JupyterLab](http://jupyterlab.github.io/jupyterlab/)
 
 [![PyPI version](https://badge.fury.io/py/jupyterlab.svg)](https://badge.fury.io/py/jupyterlab)
+[![Downloads](https://pepy.tech/badge/jupyterlab/month)](https://pepy.tech/project/jupyterlab/month)
 [![Build Status](https://dev.azure.com/jupyterlab/jupyterlab/_apis/build/status/jupyterlab.jupyterlab?branchName=master)](https://dev.azure.com/jupyterlab/jupyterlab/_build/latest?definitionId=1&branchName=master)
 [![Documentation Status](https://readthedocs.org/projects/jupyterlab/badge/?version=stable)](http://jupyterlab.readthedocs.io/en/stable/)
 [![GitHub](https://img.shields.io/badge/issue_tracking-github-blue.svg)](https://github.com/jupyterlab/jupyterlab/issues)