Update README.md

Author: nlsschim

README.md

@@ -2,6 +2,7 @@
 
 [![Tests](https://github.com/nlsschim/codebase/actions/workflows/python-package-conda.yml/badge.svg?branch=main)](https://github.com/nlsschim/codebase/actions/workflows/python-package-conda.yml)
 [![codecov](https://codecov.io/gh/nlsschim/codebase/branch/main/graph/badge.svg?token=YRY3QZJVNA)](https://codecov.io/gh/nlsschim/codebase)
+![](https://img.shields.io/badge/python-3.9%20%7C%203.10%20%7C%203.11-blue)
 
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