DOC: Add Python versions supported badge to README [skip ci]

README.md

@@ -11,6 +11,7 @@
 [![Documentation Status](https://readthedocs.org/projects/crowsetta/badge/?version=latest)](https://crowsetta.readthedocs.io/en/latest/?badge=latest)
 [![DOI](https://zenodo.org/badge/159904494.svg)](https://zenodo.org/badge/latestdoi/159904494)
 [![PyPI version](https://badge.fury.io/py/crowsetta.svg)](https://badge.fury.io/py/crowsetta)
+[![PyPI Python versions](https://img.shields.io/pypi/pyversions/crowsetta)](https://img.shields.io/pypi/pyversions/crowsetta)
 [![codecov](https://codecov.io/gh/vocalpy/crowsetta/branch/main/graph/badge.svg?token=TXtNTxXKmb)](https://codecov.io/gh/vocalpy/crowsetta)
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
 [![All Contributors](https://img.shields.io/badge/all_contributors-1-orange.svg?style=flat-square)](#contributors-)