Force coveralls to combine jobs

.github/workflows/CI.yml

@@ -81,6 +81,20 @@ jobs:
       - name: Coveralls
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COVERALLS_FLAG_NAME: ${{ matrix.test-name }}
+          COVERALLS_PARALLEL: true
         run: |
             cd test
             coveralls --service=github
+  coveralls:
+    name: Indicate completion to coveralls.io
+    needs: test
+    runs-on: ubuntu-latest
+    container: python:3-slim
+    steps:
+      - name: Finished
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+            pip install coveralls
+            coveralls --finish