Z3c.saconfig

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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.

- Update tests to run with SQLAlchemy 2. (There are no guaranties that they
still run with older versions.)

- Ignore ``convert_unicode`` parameter in ZCML ``engine`` directive, as it is
no longer supported by SQLAlchemy 2.

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- Added support for Python 3.7 [nazrulworld]
- Added support for Python 3.8 [icemac]
- Added support for zope.sqlalchemy >= 1.2 [cklinger]
- Updated local bootstrap.py [cklinger]
- Use newer SQLAlchemy for tests [cklinger]

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- Added Python 3.5 and 3.6 compatibility [nazrulworld]
- fix: `Issue with python3 compatibility, on zope interface implementation <https://github.com/zopefoundation/z3c.saconfig/issues/4>`_ [nazrulworld]

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- Drop support for sqlalchemy < 0.5
[oggers]

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- Register engine factory setup using a zcml action