Sphinxcontrib-zopeext

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* Actually add the namespace package!
* Working GitHub CI and ReadTheDocs.

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* Drop support for Python 3.6
* Drop support for Sphinx 3 (minimum version is now 4.5.0)
* Resolves issue 9: No upper bounds on versions. (Using PDM instead of Poetry.)

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* Resolves issue 7, support for Sphinx 5.x. (Thanks to Jerry James jamesjer).
* Better test coverage for different version combinations.

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* Resolves issue 5 by removing sphinxcontrib/__init__.py which could be installed
by different sphinxcontrb packages like sphinxcontrib-asyncio.

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* Resolves issue 3 (bug when missing members were requested).
* Added more extensive testing following Sphinx's examples.

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* Major restructuring of code to work with poetry rather than setuptools.
* Update and simplification of code to work with Sphinx >= 3.4.2. Prior
versions relied on some private behaviour which is deprecated. The new
version can now use the public API.
* Resolves issue 1 by inserting a small javascript snippet that changes
``class="py interface"`` to ``class="py interface class"`` so that themes
which don't provide support for styling interface (most of them) will
fallback to using the same format as a class.