Zope-schema

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- Nothing changed yet.

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- Drop support for Python 2.6, 3.2, and 3.3.

- Add support for Python 3.5 and 3.6.

- Drop support for 'setup.py test'. Use zope.testrunner instead.

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- Fix description of min max field: max value is included, not excluded.

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- Add support for Python 3.4.

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- Add an event on field properties to notify that a field has been updated.
This event enables definition of subscribers based on an event, a context
and a field. The event contains also the old value and the new value.
(also see package ``zope.schemaevent`` that define a field event handler)

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- PEP 8 cleanup.

- Don't raise RequiredMissing if a field's defaultFactory returns the field's
missing_value.

- Update ``boostrap.py`` to version 2.2.

- Add the ability to swallow ValueErrors when rendering a SimpleVocabulary,
allowing for cases where vocabulary items may be duplicated (e.g., due to
user input).

- Include the field name in ``ConstraintNotSatisfied``.