Zope-minmax

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- Make the ``AbstractValue`` class public in ``zope.minmax``. It was
already documented to be public.

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- Add support for Python 3.5 and 3.6.

- Drop support for Python 2.6 and 3.3.

- Bring unit test coverage to 100% (including branches).

- Convert doctests to Sphinx documentation, including building docs
and running doctest snippets under ``tox``.

- Host documentation at https://zopeminmax.readthedocs.io

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- Add support for PyPy3.

- Add support Python 3.4.

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- Add support for Python 3.3 and PyPy.

- Replace deprecated ``zope.interface.implements`` usage with equivalent
``zope.interface.implementer`` decorator.

- Drop support for Python 2.4 and 2.5.

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- Use the standard Python doctest module instead of the deprecated
zope.testing.doctest.

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- Fix homepage link and mailing list address.