Z3c.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 3.11.

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- Add support for Python 3.6, 3.7, 3.8, 3.9, 3.10, PyPy3.

- Drop support for Python 3.3 and 3.4.

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

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- Fixed credit card industry validation to check the first number, not
the second.

- Added support for Python 3.4, 3.5 and PyPy.

- Dropped support for Python 2.6.

- Achieve 100% code test coverage.

- Moved documentation to http://z3cschema.readthedocs.io (see :pr:`11`).

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- Added support for Python 3.3.

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

- Dropped support for Python 2.4 and 2.5.

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- Fixed i18n files after something injected 'fuzzy' into the PO files.