MNT: corrections to setup.cfg; use "pytest"; add "make dist" target

[mwtoews]

This PR is very similar to https://github.com/corteva/geocube/pull/111

• setup.cfg:
  • remove bdist_universal option
  • Use license_files to side-step warning in python -m build
  • Specify long_description_content_type to side-step warning in twine check dist/*
  • Add dynamic version from attribute
• setup.py is now a basic shim file, and does nothing custom; it might be removed at some point
• Use pytest command instead of py.test (ref)
• Add make dist target, which was referenced in the Makefile
• Add twine check --strict dist/* before uploading release -- also .whl files could and should be uploaded to PyPI
• There is no "recusive-prune" option for MANIFEST.in -- just "prune"

[codecov[bot]]

Codecov Report

Merging #534 (2c0da74) into master (964a0b3) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #534   +/-   ##
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  Coverage   96.22%   96.22%           
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  Files          13       13           
  Lines        1591     1591           
=======================================
  Hits         1531     1531           
  Misses         60       60           

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[mwtoews]

I'll assume that "Test latest dependencies" is unrelated. Merge #536 before this one, and I'll merge it here too to get the build test.

[snowman2]

Looks great 👍. Did you want to squash your commits or do you mind if I do it on merge?

[mwtoews]

Yes, squash with title-only is good, as a xref to the PR is sufficient. Thanks!

[snowman2]

Thanks @mwtoews 👍