Add coveralls github action

Author: softwareengineerprogrammer

.github/workflows/github-actions.yml

@@ -121,6 +121,10 @@ jobs:
         TOXPYTHON: '${{ matrix.toxpython }}'
       run: >
         tox -e ${{ matrix.tox_env }} -v
+    - name: Coveralls
+      uses: coverallsapp/github-action@master
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
 
   deploy_docs:
     name: Deploy docs to GitHub Pages