Pytest-super-check

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* Mark as unmaintained.

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* Support Python 3.11.

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* Drop Python 3.6 support.

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* Add type hints.

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* Support Python 3.10.

* Stop distributing tests to reduce package size. Tests are not intended to be
run outside of the tox setup in the repository. Repackagers can use GitHub's
tarballs per tag.

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* Drop Python 3.5 support.
* Support Python 3.9.
* Move license from BSD to MIT License.