Zope.principalannotation

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- Nothing changed yet.

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- Drop support for Python 2.7, 3.5, 3.6.

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

- Add support for Python 3.11.

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- Add support for Python 3.8, 3.9 and 3.10.

- Drop support for Python 3.4.

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- Add support for Python 3.7.

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- Add support for Python 3.5 and 3.6.

- Drop support for Python 2.6 and 3.3.

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- Replace use of long-deprecated ``zope.testing.doctest`` with stdlib's
``doctest``.