Repoze.sphinx.autointerface

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- Remove sphinx.util.force_decode. Previously we hacked it in to support Python
2 and Sphinx 3.x, but Sphinx 4.0 deprecated it and dropped Python 2 support.

- Replace Travis-CI with GitHub Actions

- Add support for Python 3.6, 3.7, 3.8, 3.9, 3.10, and PyPy3.

- Drop support for Python 2.7, 3.3, 3.4, 3.5, and PyPy.

- Update to work with newer Sphinx versions:

* Sphinx.domains -> Sphinx.registry.domains
* Sphinx.override_domain(D) -> Sphinx.add_domain(D, override=True)

- Drop support for Sphinx < 4.0.

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- Add support for Python 3.3, 3.4, and 3.5.

- Drop support for Python 2.6 and 3.2.

- Allow cross references using the ``:class:`` directive to use the
``.`` for "fuzzy" searching. Thanks to Jason Madden for the patch.

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- Remove ``setup.py`` dependency on ``ez_setup.py``.

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- PyPy compatibility.

- Python 3.2+ compatibility. Thanks to Arfrever for the patch.

- Include interface docs under the ``automodule`` directive. Thanks to
Krys Lawrence for the patch.

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- Fix ``TypeError: 'NoneType' object is not iterable`` error when generating
a rendering of an interface under Python 2.7.