Update README.rst

add test badge

Author: rhoadesScholar

README.rst

@@ -3,5 +3,6 @@ funlib.segment
 
 .. image:: https://travis-ci.com/funkelab/funlib.segment.svg?branch=master
   :target: https://travis-ci.com/funkelab/funlib.segment
+[![Test](https://github.com/funkelab/funlib.segment/actions/workflows/tests.yaml/badge.svg)](https://github.com/funkelab/funlib.segment/actions/workflows/tests.yaml)
 
 Tools for (re)labelling of arrays and graphs.