Grokcore.content

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- Nothing changed yet.

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- Drop support for deprecated ``python setup.py test``.

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- Add support for Python 3.7, 3.8, 3.9, 3.10, 3.11.

- Drop support for Python 2.7, 3.4, 3.5, 3.6.

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- Rearrange tests such that Travis CI can pick up all functional tests too.

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- Fix dependencies by removing ZODB3.

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- Use ``zope.interface.implementer`` decorator instead of
``zope.interface.implements`` with classes to support Python 3.

- Express support for Python 2.7, 3.4 and 3.5 and 3.6,

- Use tox for test orchestration.