Zope.pytestlayer

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

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- Fix tests to run with `pytest >= 4.2.0`.

- Migrate to Github.

- Do not break when rerunning a doctest using `pytest-rerunfailures`.

- Add support for Python 3.8.

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- Add support for Python 3.6, 3.7 and PyPy3.

- Drop support for Python 3.4.

- Fix tests to run with `pytest >= 3.9.1`.

- Release also as universal wheel.

- Update to new pytest fixture API to avoid DeprecationWarnings. (10)

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- Make installation process compatible with `setuptools >= 30.0`.

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- Fix tests to pass if `pytest >= 3.0` is used for testing.

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- Support Python 3.4, 3.5 and PyPy.

- Use tox as testrunner.