Fix typo in README.md

* README.md

Author: real-yfprojects

README.md

@@ -5,7 +5,7 @@
 [![pre-commit](https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit)](https://github.com/pre-commit/pre-commit)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
-Enforce rules regarding frozen revisions in `pre-commit-config.yaml`.
+Enforce rules regarding frozen revisions in `.pre-commit-config.yaml`.
 
 ```yaml
 # Enforce frozen revisions in `.pre-commit-config.yaml`