Replace travis badge with GitHub actions badge

README.md

@@ -1,7 +1,7 @@
 # Jupyter Server Proxy
 
 [![ReadTheDocs badge](https://img.shields.io/readthedocs/jupyter-server-proxy?logo=read-the-docs)](https://jupyter-server-proxy.readthedocs.io/)
-[![Travis badge](https://img.shields.io/travis/com/jupyterhub/jupyter-server-proxy?logo=travis)](https://travis-ci.com/jupyterhub/jupyter-server-proxy)
+[![GitHub Workflow Status](https://img.shields.io/github/workflow/status/jupyterhub/jupyter-server-proxy/Test?logo=github)](https://github.com/jupyterhub/jupyter-server-proxy/actions)
 [![PyPI badge](https://img.shields.io/pypi/v/jupyter-server-proxy.svg?logo=pypi)](https://pypi.python.org/pypi/jupyter-server-proxy)
 [![Conda badge](https://img.shields.io/conda/vn/conda-forge/jupyter-server-proxy?logo=conda-forge)](https://anaconda.org/conda-forge/jupyter-server-proxy)
 [![NPM badge](https://img.shields.io/npm/v/@jupyterlab/server-proxy.svg?logo=npm)](https://www.npmjs.com/package/@jupyterlab/server-proxy)