Add badge (for test workflow, not lint) [CI skip]

README.md

@@ -5,6 +5,7 @@
 [![PyPI downloads](https://img.shields.io/pypi/dm/pypistats.svg)](https://pypistats.org/packages/pypistats)
 [![Build Status](https://travis-ci.org/hugovk/pypistats.svg?branch=master)](https://travis-ci.org/hugovk/pypistats)
 [![Build Status](https://dev.azure.com/hugovk/hugovk/_apis/build/status/hugovk.pypistats?branchName=master)](https://dev.azure.com/hugovk/hugovk/_build/latest?definitionId=1?branchName=master)
+[![Actions Status](https://github.com/hugovk/pypistats/workflows/test/badge.svg)](https://github.com/hugovk/pypistats/actions)
 [![codecov](https://codecov.io/gh/hugovk/pypistats/branch/master/graph/badge.svg)](https://codecov.io/gh/hugovk/pypistats)
 [![GitHub](https://img.shields.io/github/license/hugovk/pypistats.svg)](LICENSE.txt)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)