Bump coveralls from 1.3.0 to 1.5.1
Bump coveralls from 1.3.0 to 1.5.1

Bumps [coveralls](https://github.com/coveralls-clients/coveralls-python) from 1.3.0 to 1.5.1.
- [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/1.3.0...1.5.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
acifani/flask-sqla2api