Use line-based matrix values for nicer diffs. Remove Python 3.6 and bump to Python 3.10, matching jaraco/skeleton and pypa/setuptools approaches.
Use line-based matrix values for nicer diffs. Remove Python 3.6 and bump to Python 3.10, matching jaraco/skeleton and pypa/setuptools approaches.

pypa/setuptools,pypa/setuptools,pypa/setuptools