Pytest-randomly

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* Update ``MANIFEST.in`` so tests are included in the sdist tarball again.

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* Converted setuptools metadata to configuration file. This meant removing the
``__version__`` attribute from the package. If you want to inspect the
installed version, use
``importlib.metadata.version("pytest-randomly")``
(`docs <https://docs.python.org/3.8/library/importlib.metadata.html#distribution-versions>`__ /
`backport <https://pypi.org/project/importlib-metadata/>`__).
* Convert reading entrypoints to use ``importlib.metadata``. Depend on
``importlib-metadata`` on Python < 3.8.
* Update Python support to 3.5-3.8.

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* Add plugins via entry points ``pytest_randomly.random_seeder`` to allow
outside packages to register additional random generators to seed. This has
added a dependency on the ``entrypoints`` package.

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* Update Python support to 3.5-3.7, as 3.4 has reached its end of life.
* Handle ``CollectError``\s and ``ImportError``\s during collection when
accessing ``item.module``.

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* Fix including tests in sdist after re-arrangement in 2.1.0.

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* Add the option ``--randomly-seed=last`` to reuse the last used value for the
seed.