Remove codecov token, no longer required for public projects

Author: mvantellingen

.github/workflows/python-test.yml

@@ -63,7 +63,3 @@ jobs:
       run: tox -e coverage-report
     - name: Upload to codecov
       uses: codecov/codecov-action@v1.0.6
-      with:
-        token: ${{ secrets.CODECOV_TOKEN }}
-        flags: unittest
-