Update README.md

Now it works

Author: rflamary

README.md

@@ -2,7 +2,7 @@
 
 [![PyPI version](https://badge.fury.io/py/POT.svg)](https://badge.fury.io/py/POT)
 [![Anaconda Cloud](https://anaconda.org/conda-forge/pot/badges/version.svg)](https://anaconda.org/conda-forge/pot)
-[![Build Status]([https://github.com/PythonOT/POT/workflows/build/badge.svg?branch=master&event=push](https://github.com/PythonOT/POT/actions/workflows/build_tests.yml/badge.svg))](https://github.com/PythonOT/POT/actions)
+[![Build Status](https://github.com/PythonOT/POT/actions/workflows/build_tests.yml/badge.svg)](https://github.com/PythonOT/POT/actions)
 [![Codecov Status](https://codecov.io/gh/PythonOT/POT/branch/master/graph/badge.svg)](https://codecov.io/gh/PythonOT/POT)
 [![Downloads](https://pepy.tech/badge/pot)](https://pepy.tech/project/pot)
 [![Anaconda downloads](https://anaconda.org/conda-forge/pot/badges/downloads.svg)](https://anaconda.org/conda-forge/pot)