Z3c.checkversions

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- Fix parsing of versions that are really requirements specifications.
(`24 <https://github.com/zopefoundation/z3c.checkversions/issues/24>`_)

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- Add support for Python 3.10, 3.11.

- Drop support for Python 2.7, 3.5, 3.6.

- Pin ``setuptools < 66`` as newer versions are no longer compatible.

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- Add support for Python 3.8, drop support for Python 3.4.

- Improve error message in case zc.buildout is not installed.

- Improve installation instruction.

- Pass the index url to both the 'installed' and 'buildout' checkers.

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- Add support for Python 3.7.

- Drop support for `python setup.py test`.

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- Fix compatibility with setuptools 39 by using an API introduced
in setuptools 8. (`GH 8`_)

- Add support for Python 3.5, 3.6 and PyPy3.

- Drop support for Python 2.6 and 3.3.

- Standardize namespace ``__init__``.

.. _GH 8 : https://github.com/zopefoundation/z3c.checkversions/issues/8