📝 docs: use ruff badge

README.md

@@ -4,7 +4,7 @@ Some pre-commit hooks for docs.
 
 <p align="center">
    <a href="LICENSE"><img alt="LICENSE" src="https://img.shields.io/github/license/ShigureLab/dochooks?style=flat-square"></a>
-   <a href="https://github.com/psf/black"><img alt="black" src="https://img.shields.io/badge/code%20style-black-000000?style=flat-square"></a>
+   <a href="https://github.com/astral-sh/ruff"><img alt="ruff" src="https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json&style=flat-square"></a>
    <a href="https://gitmoji.dev"><img src="https://img.shields.io/badge/gitmoji-%20😜%20😍-FFDD67?style=flat-square" alt="Gitmoji"></a>
 </p>