pipeline: expect coveralls cmd to succeed

.github/workflows/python.yml

@@ -48,6 +48,6 @@ jobs:
     - run: pip install 'coveralls>=1.9.0,<2,!=1.11.0'
     # https://github.com/coverallsapp/github-action/issues/30
     # https://github.com/coverallsapp/github-action/issues/4#issuecomment-529399410
-    - run: coveralls || echo TODO
+    - run: coveralls
       env:
         COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}