Add isort badge to README.md

Author: Electronic-Mango

README.md

@@ -3,6 +3,7 @@
 [![CodeQL](https://github.com/Electronic-Mango/reddit-python-api/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/Electronic-Mango/reddit-python-api/actions/workflows/codeql-analysis.yml)
 [![Black](https://github.com/Electronic-Mango/reddit-python-api/actions/workflows/black.yml/badge.svg)](https://github.com/Electronic-Mango/reddit-python-api/actions/workflows/black.yml)
 [![Flake8](https://github.com/Electronic-Mango/reddit-python-api/actions/workflows/flake8.yml/badge.svg)](https://github.com/Electronic-Mango/reddit-python-api/actions/workflows/flake8.yml)
+[![isort](https://github.com/Electronic-Mango/reddit-python-api/actions/workflows/isort.yml/badge.svg)](https://github.com/Electronic-Mango/reddit-python-api/actions/workflows/isort.yml)
 [![PyPI - Version](https://img.shields.io/pypi/v/reddit-python-api)](https://pypi.org/project/reddit-python-api/)