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* Upgrade vendored BWIPP to its 2021-02-06 release.
You can read its changelog in the `treepoem repo <https://github.com/adamchainz/treepoem/blob/main/src/treepoem/postscriptbarcode/CHANGES>`__.
* 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.