Bump coveralls from 2.1.1 to 2.1.2

Bumps [coveralls](https://github.com/coveralls-clients/coveralls-python) from 2.1.1 to 2.1.2.
- [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@2.1.1...2.1.2)

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

test-requirements.txt

@@ -10,7 +10,7 @@ attrs==19.3.0             # via aiohttp, pytest
 certifi==2020.4.5.1       # via requests
 chardet==3.0.4            # via aiohttp, requests
 coverage==5.1             # via coveralls, pytest-cov
-coveralls==2.1.1          # via -r test-requirements.in
+coveralls==2.1.2          # via -r test-requirements.in
 docopt==0.6.2             # via coveralls
 flake8==3.8.1             # via pytest-flake8
 idna==2.9                 # via requests, yarl