Pytest-randomly

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* Add `pytest-xdist <https://pypi.org/project/pytest-xdist/>`__ support.
Previously it only worked reliably when setting ``--randomly-seed``
explicitly. When not provided, the default seed generated in workers could
differ and collection would fail. Now when it is not provided, all xdist
worker processes shared the same default seed generated in the main
process.

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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.