Zope.hookable

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- Stop using the setuptools ``Feature`` class, allowing this
project to be built from source with newer versions of setuptools
that remove that functionality.

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- Add support for Python 3.7 and 3.8.

- Drop support for Python 3.4.

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- Expose the ``__doc__`` (and, where applicable, ``__bases__`` and
``__dict__``) of the hooked object. This lets Sphinx document them.
See `issue 6 <https://github.com/zopefoundation/zope.hookable/issues/6>`_.

- Respect ``PURE_PYTHON`` at runtime. At build time, always try to
build the C extensions on supported platforms, but allow it to fail.
See `issue 7
<https://github.com/zopefoundation/zope.hookable/issues/7>`_.

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- Drop support for Python 2.6, 3.2 and 3.3.

- Add support for Python 3.5 and 3.6.

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

- Add support for Python 3.4.

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

- Fix extension compilation on Py3k.