Gocept.pytestlayer

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- Nothing changed yet.

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- Ensure compatibility with pytest >= 7.1.3.
``.layered.LayeredTestCaseInstance`` now has to inherit from
``_pytest.unittest.UnitTestCase``.

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- Use GitHub actions as CI.

- Add support for Python 3.9 and 3.10.

- Drop support for Python 3.6.

- Add a workaround for
`4 <https://github.com/gocept/gocept.pytestlayer/issues/4>`_: Use
``gcoept.pytestlayer.doctest.DocTestSuite`` instead of
``doctest.DocTestSuite`` to circumvent the issue.

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Backwards imcompatible changes
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- Drop support for Python 2.7 and 3.5 and ``pytest < 5.0``. (8)

Features
--------

- Support ``pytest >= 6.0``. (8)

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- Ensure compatibility with pytest > 5.4.2. We need a
``_explicit_tearDown`` on our ``LayeredTestCaseFunction`` now.

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- Ensure compatibility with pytest > 5.4. We need a
``_needs_explicit_tearDown`` on our ``LayeredTestCaseFunction`` now.