Zc.relation

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- Nothing changed yet.

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- Drop support for Python 2.7, 3.5, 3.6.
[ale-rt]

- Fix the dependency on the ZODB, we just need to depend on the BTrees package.
Refs. 11.
[ale-rt]

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- Adapt code for PEP-479 (Change StopIteration handling inside generators).
See: https://peps.python.org/pep-0479.
Fixes 11.
[ale-rt]

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- Another attempt to fix PyPI page by using correct expected metadata syntax.

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- Fix PyPI page by using correct ReST syntax.

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- Add support for Python 3.5 and 3.6.