Update README.md

Author: gaborbernat

README.md

@@ -8,6 +8,6 @@ status](https://readthedocs.org/projects/py-filelock/badge/?version=latest)](htt
 [![Code style:
 black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![Downloads](https://static.pepy.tech/badge/filelock/month)](https://pepy.tech/project/filelock)
-[![check](https://github.com/tox-dev/py-filelock/actions/workflows/check.yml/badge.svg)](https://github.com/tox-dev/py-filelock/actions/workflows/check.yml)
+[![check](https://github.com/tox-dev/py-filelock/actions/workflows/check.yaml/badge.svg)](https://github.com/tox-dev/py-filelock/actions/workflows/check.yaml)
 
 For more information checkout the [official documentation](https://py-filelock.readthedocs.io/en/latest/index.html).