Grokcore.site

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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 3.9, 3.10, 3.11.

- Adapt code to ``zope.site >= 4.4`` thus requiring at least that version.
(`7 <https://github.com/zopefoundation/grokcore.site/pull/7>`_)

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- Fix DeprecationWarnings.

- Drop support for Python 3.4 and add support for 3.7 and 3.8.

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- Rearrange tests such that Travis CI can pick up all functional tests too.

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- Do not import `getSite` from `zope.site.hooks` anymore but from
`zope.component.hooks`.

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- Fix dependencies by removing ZODB3.