Add python versions badge

Author: vivekjoshy

README.md

@@ -2,7 +2,7 @@
 ![](https://i.imgur.com/tSTFzZY.gif)
 
 
-[![Tests](https://github.com/OpenDebates/openskill.py/actions/workflows/main.yml/badge.svg)](https://github.com/OpenDebates/openskill.py/actions/workflows/main.yml) [![codecov](https://codecov.io/gh/OpenDebates/openskill.py/branch/main/graph/badge.svg?token=Ep07QEelsi)](https://codecov.io/gh/OpenDebates/openskill.py) ![PyPI - Downloads](https://img.shields.io/pypi/dm/openskill) [![Documentation Status](https://readthedocs.org/projects/openskillpy/badge/?version=latest)](https://openskillpy.readthedocs.io/en/latest/?badge=latest)
+[![Tests](https://github.com/OpenDebates/openskill.py/actions/workflows/main.yml/badge.svg)](https://github.com/OpenDebates/openskill.py/actions/workflows/main.yml) [![codecov](https://codecov.io/gh/OpenDebates/openskill.py/branch/main/graph/badge.svg?token=Ep07QEelsi)](https://codecov.io/gh/OpenDebates/openskill.py) ![PyPI - Downloads](https://img.shields.io/pypi/dm/openskill) [![Documentation Status](https://readthedocs.org/projects/openskillpy/badge/?version=latest)](https://openskillpy.readthedocs.io/en/latest/?badge=latest) ![PyPI - Python Version](https://img.shields.io/pypi/pyversions/openskill)
 
 
 Python implementation of Weng-Lin Bayesian ranking, a better, license-free alternative to TrueSkill