Zope-contentprovider

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- Fixed UpdateNotCalled being an instance rather than an exception class
(https://github.com/zopefoundation/zope.contentprovider/issues/4).

- Host documentation at https://zopecontentprovider.readthedocs.io

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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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- Add support for PyPy and PyPy3.

- Add support for Python 3.4.

- Add support for testing on Travis.

====================

- Add Python 3.3 support.

- Replace deprecated ``zope.component.adapts`` usage with equivalent
``zope.component.adapter`` decorator.

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

- Drop support for Python 2.4 and 2.5.

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- Fix unit tests broken under Python 2.4 by the switch to the standard
library ``doctest`` module.

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- Prefer the standard library's ``doctest`` module to the one from
``zope.testing.``