Zope.keyreference

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- Nothing changed yet.

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- Drop support for Python 2.7, 3.5, 3.6.

- Add support for Python 3.11.

- Make the tests compatible with ``zope.testing >= 5``.

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- Remove ``__cmp__`` methods. Since the implementation of the rich
comparison methods (``__eq__``, etc) in 4.0a1, the interpreter won't
call ``__cmp__``, even on Python 2. See `issue 10
<https://github.com/zopefoundation/zope.keyreference/issues/10>`_.

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

- Drop support for Python 3.4.

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- Add support for Python 3.5, 3.6, and 3.7.

- Drop support for Python 2.6 and 3.3.

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- Add support for PyPy (PyPy3 blocked on PyPy3-compatible ``zodbpickle``).

- Add support for Python 3.4.

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- Add support for testing on Travis.