Bump coveralls from 1.11.1 to 2.0.0

Bumps [coveralls](https://github.com/coveralls-clients/coveralls-python) from 1.11.1 to 2.0.0.
- [Release notes](https://github.com/coveralls-clients/coveralls-python/releases)
- [Changelog](https://github.com/coveralls-clients/coveralls-python/blob/master/CHANGELOG.md)
- [Commits](TheKevJames/coveralls-python@1.11.1...2.0.0)

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

requirements-ci.txt

@@ -1,7 +1,7 @@
 pytest==5.4.1
 pytest-cov==2.8.1
 coverage==5.0.4
-coveralls==1.11.1
+coveralls==2.0.0
 pycodestyle==2.5.0
 mypy==0.770
 pydocstyle==5.0.2