dev comment about pre-commit

Author: s-light

README.rst

@@ -115,3 +115,5 @@ Contributing
 Contributions are welcome! Please read our `Code of Conduct
 <https://github.com/s-light/CircuitPython_ansi_escape_code/blob/HEAD/CODE_OF_CONDUCT.md>`_
 before contributing to help this project stay welcoming.
+
+to locally check if your changes have a chance to pass the workflows run `pre-commit run --all-files` multiple times. ;-)