Zope.app.schema

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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 3.7, 3.8, 3.9, 3.10, 3.11.

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- Replaced the local implementation of ``ZopeVocabularyRegistry`` with
one imported from ``zope.vocabularyregistry``. Backwards
compatibility imports remain.

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- Packaging: Add the Python version and implementation classifiers.

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- Support for Python 3.5, 3.6 and PyPy has been added.

- Added support for tox.

- Drop dependency on ``zope.app.testing``, since it was not needed.

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- Package modernization including manifest.