Zc.table

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- Nothing changed yet.

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- Drop support for Python 2.7, 3.5, 3.6.

- Add support for Python 3.5, 3.7, 3.8, 3.9, 3.10, 3.11.

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- Make Python 3 compatible

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- Using Python's ``doctest`` module instead of deprecated
``zope.testing.doctest``.

- Removed dependency on ``zope.app.testing`` and ``zope.app.form``.

- Add test extra, move ``zope.testing`` to it.

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- Replaced html entities with unicode entities since they are xthml valid.

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- Updated tests to latest packages.