Bump coveralls from 1.8.2 to 1.9.2

Bumps [coveralls](https://github.com/coveralls-clients/coveralls-python) from 1.8.2 to 1.9.2.
- [Release notes](https://github.com/coveralls-clients/coveralls-python/releases)
- [Changelog](https://github.com/coveralls-clients/coveralls-python/blob/master/CHANGELOG.md)
- [Commits](https://github.com/coveralls-clients/coveralls-python/compare/1.8.2...1.9.2)

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

requirements-dev.txt

@@ -3,7 +3,7 @@
 -r requirements-plot.txt
 -r requirements-hyperopt.txt
 
-coveralls==1.8.2
+coveralls==1.9.2
 flake8==3.7.9
 flake8-type-annotations==0.1.0
 flake8-tidy-imports==3.1.0