Zope.app.onlinehelp

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- Nothing changed yet.

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- Add support for Python 3.11.

- Drop support for Python 2.7, 3.5, 3.6.

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- Add support for Python 3.7, 3.8, 3.9, and 3.10.

- Drop support for Python 3.4.

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- The help namespace no longer modifies the global help object on
traversal. Instead it returns a new proxy object. This makes it
thread-safe. See `issue 4
<https://github.com/zopefoundation/zope.app.onlinehelp/issues/4>`_.

- ``getTopicFor`` now really returns the first found topic in the
event that the object implements multiple interfaces that have
registered topics for the given view. Previously it would return the
topic for the least-specific interface.

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- Drop test dependency on ``zope.app.securitypolicy``. It wasn't used,
and it isn't yet fully ported to Python 3.

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- Add support for Python 3.4, 3.5, 3.6 and PyPy.

- Change ZODB dependency to persistent.

- Drop test dependency on ``zope.app.testing``,
``zope.app.zcmlifiles`` and ``zope.app.apidoc``, among others.