Zc.catalog

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- Nothing changed yet.

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- Drop support for Python 3.4 as it reached its end of life.

- Add support for Python 3.7 and 3.8a2.

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- Add Python 3 compatibility for the ``zopyx.txng3.ext`` stemmer.
See `4 <https://github.com/zopefoundation/zc.catalog/issues/4>`_.

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- Add support for Python 3.4, 3.5, 3.6 and PyPy. Note that the
``zopyx.txng3.ext`` stemmer is not available on Python 3.

- Remove test dependency on zope.app.zcmlfiles and zope.app.testing,
among others.

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- Using Python's ``doctest`` module instead of deprecated
``zope.testing.doctest``.

- Move ``zope.intid`` to dependencies.

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- Fix the extent catalog's `searchResults` method to work when using a
local uid source.

- Replaced a testing dependency on ``zope.app.authentication`` with
``zope.password``.

- Removed ``zope.app.server`` test dependency.