Request: --requirements-file to support setup.py

[jamesbraza]

I think it would be useful if --requirements-file could support setup.py. It seems that currently flake8-requirements assumes the requirements come from a requirements.txt.

Use case is a monorepo with:

• setup.cfg containing known-modules in the directory where flake8 is being invoked
• setup.py containing requirements in another directory

Thank you in advance for entertaining this request 😃

[jamesbraza]

I am not sure why I opened this, but setup.py is supported: https://github.com/arkq/flake8-requirements/blob/v1.7.2/src/flake8_requirements/checker.py#L651