Merge pull request #187 from lincc-frameworks/pypi_badge

add pypi badge

Author: dougbrn

README.md

@@ -2,6 +2,7 @@
 
 [![Template](https://img.shields.io/badge/Template-LINCC%20Frameworks%20Python%20Project%20Template-brightgreen)](https://lincc-ppt.readthedocs.io/en/latest/)
 
+[![PyPI](https://img.shields.io/pypi/v/nested-pandas?color=blue&logo=pypi&logoColor=white)](https://pypi.org/project/nested-pandas/)
 [![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/lincc-frameworks/nested-pandas/smoke-test.yml)](https://github.com/lincc-frameworks/nested-pandas/actions/workflows/smoke-test.yml)
 [![codecov](https://codecov.io/gh/lincc-frameworks/nested-pandas/branch/main/graph/badge.svg)](https://codecov.io/gh/lincc-frameworks/nested-pandas)
 [![Read the Docs](https://img.shields.io/readthedocs/nested-pandas)](https://nested-pandas.readthedocs.io/)