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- Remove setuptools fossils.
- ``unittest.TestCase.subTest`` support
(`91 <https://github.com/zopefoundation/zope.testrunner/issues/91>`_).
- remove support for ``setup.py``'s ``test`` command.
Support for this command has been dropped by modern
``setuptools`` versions and correspondingly has been removed from
most ``zopefoundation`` packages; ``zope.testrunner`` now follows.
- ``setup.py``'s ``ftest`` command is now only supported
when the used ``setuptools`` version still supports ``test``.