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* 1296: Setuptools now vendors its own direct dependencies, no
longer relying on the dependencies as vendored by pkg_resources.
* 296: Removed long-deprecated support for iteration on
Version objects as returned by ``pkg_resources.parse_version``.
Removed the ``SetuptoolsVersion`` and
``SetuptoolsLegacyVersion`` names as well. They should not
have been used, but if they were, replace with
``Version`` and ``LegacyVersion`` from ``packaging.version``.