Adapt code style badge in README.md

README.md

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 <a href='https://kiez.readthedocs.io/en/latest/?badge=latest'><img src='https://readthedocs.org/projects/kiez/badge/?version=latest' alt='Documentation Status' /></a>
 <a href="https://pypi.org/project/kiez"/><img alt="Stable python versions" src="https://img.shields.io/pypi/pyversions/kiez"></a>
 <a href="https://github.com/dobraczka/kiez/blob/main/LICENSE"><img alt="License BSD3 - Clause" src="https://img.shields.io/badge/license-BSD--3--Clause-blue"></a>
-<a href="https://github.com/psf/black"><img alt="Code style: black" src="https://img.shields.io/badge/code%20style-black-000000.svg"></a>
+<a href="https://github.com/astral-sh/ruff"><img alt="Code style: ruff" src="https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json"></a>
 </p>
 
 A Python library for hubness reduced nearest neighbor search for the task of entity alignment with knowledge graph embeddings. The term kiez is a [german word](https://en.wikipedia.org/wiki/Kiez) that refers to a city neighborhood.