Admin: lint test on PR complains about >79 but black checks for 88.

[psobolewskiPhD]

This PR adds setup.cfg (because that's what flake8 uses) and sets 88 as the line length for flake8.

Pull request recommendations:

• [ ] Name your pull request your-development-type/short-description. Ex: feature/read-tiff-files
• [ ] Link to any relevant issue in the PR description. Ex: Resolves [gh-12], adds tiff file format support
• [ ] Provide context of changes.
• [ ] Provide relevant tests for your feature or bug fix.
• [ ] Provide or update documentation for any feature added by your pull request.

Thanks for contributing!

[psobolewskiPhD]

Oh shit, i messed something up.