Multilint

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* Require ``isort`` 5.0.0+ and stop passing it the ``--recursive`` argument,
which is now a default.

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* Support Python 3.8.
* 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("multilint")``
(`docs <https://docs.python.org/3.8/library/importlib.metadata.htmldistribution-versions>`__ /
`backport <https://pypi.org/project/importlib-metadata/>`__).

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* Drop ``setup.py check`` support since ``twine check`` is the new, more
complete, recommended way of checking distributable file correctness, as per
the warning:

.. code-block:: sh

warning: Check: This command has been deprecated. Use `twine check`
instead: https://packaging.python.org/guides/making-a-pypi-friendly-readmevalidating-restructuredtext-markup


``multilint`` can't run ``twine check`` since it needs running on your
``dist`` files instead of the ``setup.py`` file.

You can integrate it on a typical ``tox`` setup with an extra command
``tox dist/*``. For more information see the `twine check
documentation <https://twine.readthedocs.io/en/latest/twine-check>`__ and
the `packaging documentation
<https://packaging.python.org/guides/making-a-pypi-friendly-readmevalidating-restructuredtext-markup>`__.

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* Drop Python 2 and 3.4 support, only Python 3.5+ is supported now.
* Add support for running `Black <https://pypi.org/project/black/>`__, the
Python code auto-formatter.
* Drop support for Flake8 < 3.0.0.

------------------

* Support positional arguments for paths.

------------------

* Fix for modernize 0.6.1+
* Run modernize on the multilint codebase itself, so it now requires six