Added tag 8.0.2 for changeset 1c03d512e39d
Bumped to 8.0.3 in preparation for next release.
Define a __hash__ on the packaging.version.Version subclasses

In Python 3.x a subclass will not inherent the __hash__ method from
the parent classes if the subclass defines a __eq__ method. This
means that without defining our own __hash__ the SetuptoolsVersion
classes are unhashable.
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