coverage
pytest-coverage
coveralls
mock
pytest
maya; python_version == '2.7' or python_version >= '3.6'

coverage
pytest-coverage
coveralls
mock
pytest>=4.6
maya; python_version == '2.7' or python_version >= '3.6'

Fix CI by specifying `pytest` lower bound
Fix CI by specifying `pytest` lower bound

```
pluggy.manager.PluginValidationError: Plugin 'pytest_cov' could not be loaded: (pytest 4.3.1 (/home/travis/virtualenv/python3.6.7/lib/python3.6/site-packages), Requirement.parse('pytest>=4.6'))!
```