Zc.beforestorage

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- Nothing changed yet.

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- Add support for Python 3.9, 3.10, 3.11.

- Drop support for Python 2.7, 3.5, 3.6.

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- Add support for Python 3.5 through 3.8.

- Drop support for Python 3.3 and 3.4.

- Fix a long-standing bug in loadBefore´. The bug was revealed by
testing against ZODB 5, for which loadBefore plays a bigger role.

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- Fix broken release

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Added ZODB4 and Python 3 support.

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Added a "before-from-file" option that can be used if the application wants to
preserve beforestorage state between application restarts.