chore: fix badge

Author: gdalle

README.md

@@ -9,7 +9,7 @@
 [![Code Style: Blue](https://img.shields.io/badge/code%20style-blue-4495d1.svg)](https://github.com/JuliaDiff/BlueStyle)
 [![arXiv](https://img.shields.io/badge/arXiv-2505.07308-b31b1b.svg)](https://arxiv.org/abs/2505.07308)
 [![DOI](https://zenodo.org/badge/801999408.svg)](https://zenodo.org/doi/10.5281/zenodo.11314275)
-| Community | [![All Contributors](https://img.shields.io/github/all-contributors/JuliaDiff/SparseMatrixColorings.jl?color=ee8449&style=flat-square)](#contributors) |
+[![All Contributors](https://img.shields.io/github/all-contributors/JuliaDiff/SparseMatrixColorings.jl?color=ee8449&style=flat-square)](#contributors)
 
 Coloring algorithms for sparse Jacobian and Hessian matrices.