Fix badge in README (#1077)

Author: krassowski

README.md

@@ -1,6 +1,6 @@
 # Language Server Protocol integration for Jupyter(Lab)
 
-[![tests](https://github.com/jupyter-lsp/jupyterlab-lsp/workflows/CI/badge.svg)](https://github.com/jupyter-lsp/jupyterlab-lsp/actions?query=workflow%3ACI+branch%3Amain)
+[![CI](https://github.com/jupyter-lsp/jupyterlab-lsp/actions/workflows/job.test.yml/badge.svg)](https://github.com/jupyter-lsp/jupyterlab-lsp/actions/workflows/job.test.yml)
 [![Documentation Status](https://readthedocs.org/projects/jupyterlab-lsp/badge/?version=latest)](https://jupyterlab-lsp.readthedocs.io/en/latest/?badge=latest)
 [![Python Demo](https://img.shields.io/badge/demo-Python-blue)](https://mybinder.org/v2/gh/jupyter-lsp/demo-python/main?urlpath=lab)
 [![R Demo](https://img.shields.io/badge/demo-R-blue)](https://mybinder.org/v2/gh/jupyter-lsp/demo-r/main?urlpath=lab)