Merge pull request #63 from gerlero/readme

Update README.md

README.md

@@ -4,7 +4,7 @@
 [![CI](https://github.com/gerlero/foamlib/actions/workflows/ci.yml/badge.svg)](https://github.com/gerlero/foamlib/actions/workflows/ci.yml)
 [![Codecov](https://codecov.io/gh/gerlero/foamlib/branch/main/graph/badge.svg)](https://codecov.io/gh/gerlero/foamlib)
 [![Checked with mypy](http://www.mypy-lang.org/static/mypy_badge.svg)](http://mypy-lang.org/)
-[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+[![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
 [![PyPI](https://img.shields.io/pypi/v/foamlib)](https://pypi.org/project/foamlib/)
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/foamlib)](https://pypi.org/project/foamlib/)
 [![Docker image](https://img.shields.io/badge/docker%20image-gerlero%2Ffoamlib-informational)](https://hub.docker.com/r/gerlero/foamlib/)