Allow configuration via pyproject.toml #664
Description
Originally reported by pradyunsg (Bitbucket: pradyunsg, GitHub: pradyunsg)
As per PEP 518, tools can use tool.<pypi-name> namespace within the pyproject.toml file if they own <pypi-name> on PyPI.
Allowing configuration via the above mechanism would allow for users to have a single file in their root directory, for configuring this coverage (and other tools) for their project. Essentially, this would allow eliminating a .coveragerc file in the root of the project in favor of using pyproject.toml.