Zc.sourcefactory

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- Nothing changed yet.

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- Add support for Python 3.8, 3.9, 3.10, 3.11.

- Drop support for Python 2.7, 3.5, 3.6.

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- Add support for Python 3.6 and 3.7.

- Drop support for Python 3.3 and 3.4.

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- Claim support for Python 3.4 and 3.5.

- Drop support for Python 2.6.

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

- Added support for Python 3.3.

- Drastically reduce testing dependencies to make porting easier.

- 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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- ``BasicSourceFactory`` now uses a class variable to tell what kind of
source to make. (Same mechanism as it was added for
``ContextualSourceFactory`` in version 0.5.0).