Bump coveralls from 3.0.0 to 3.1.0

Bumps [coveralls](https://github.com/TheKevJames/coveralls-python) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/TheKevJames/coveralls-python/releases)
- [Changelog](https://github.com/TheKevJames/coveralls-python/blob/master/CHANGELOG.md)
- [Commits](TheKevJames/coveralls-python@3.0.0...3.1.0)

Signed-off-by: dependabot[bot] <support@github.com>

test-requirements.txt

@@ -35,7 +35,7 @@ coverage==5.4
     # via
     #   coveralls
     #   pytest-cov
-coveralls==3.0.0
+coveralls==3.1.0
     # via -r test-requirements.in
 django==3.1.5
     # via -r test-requirements.in