chore(deps-dev): bump coveralls from 2.1.0 to 2.1.1

Bumps [coveralls](https://github.com/coveralls-clients/coveralls-python) from 2.1.0 to 2.1.1.
- [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@2.1.0...2.1.1)

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

dev-requirements.txt

@@ -1,6 +1,6 @@
 coverage==5.2
 coveralls==1.7.0;python_version<'3.0'
-coveralls==2.1.0;python_version>='3.6'
+coveralls==2.1.1;python_version>='3.6'
 pytest==4.6.9;python_version<'3.0'
 pytest==5.4.3;python_version>='3.6'
 pytest-cov==2.10.0