Update flake8 to 3.8.4

[pyup-bot]

This PR updates flake8 from 3.8.1 to 3.8.4.

Changelog

3.8.4

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

You can view the `3.8.4 milestone`_ on GitLab for more details.

Bugs Fixed
~~~~~~~~~~

- Fix multiprocessing errors on platforms without ``sem_open`` syscall.  (See
also `GitLab!448`_)

- Fix skipping of physical checks on the last line of a file which does not
end in a newline (See also `GitLab!451`_)

.. all links
.. _3.8.4 milestone:
 https://gitlab.com/pycqa/flake8/-/milestones/37

.. merge request links
.. _GitLab!448:
 https://gitlab.com/pycqa/flake8/merge_requests/448
.. _GitLab!451:
 https://gitlab.com/pycqa/flake8/merge_requests/451

3.8.3

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

You can view the `3.8.3 milestone`_ on GitLab for more details.

Bugs Fixed
~~~~~~~~~~

- Also catch ``SyntaxError`` when tokenizing (See also `GitLab!433`_,
`GitLab662`_)

- Fix ``--jobs`` default display in ``flake8 --help`` (See also `GitLab!434`_,
`GitLab665`_)

.. all links
.. _3.8.3 milestone:
 https://gitlab.com/pycqa/flake8/-/milestones/36

.. issue links
.. _GitLab662:
 https://gitlab.com/pycqa/flake8/issues/662
.. _GitLab665:
 https://gitlab.com/pycqa/flake8/issues/665

.. merge request links
.. _GitLab!433:
 https://gitlab.com/pycqa/flake8/merge_requests/433
.. _GitLab!434:
 https://gitlab.com/pycqa/flake8/merge_requests/434

3.8.2

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

You can view the `3.8.2 milestone`_ on GitLab for more details.

Bugs Fixed
~~~~~~~~~~

- Improve performance by eliminating unnecessary sort (See also `GitLab!429`_)

- Improve messaging of ``--jobs`` argument by utilizing ``argparse`` (See also
`GitLab!428`_, `GitLab567`_)

- Fix file configuration options to be relative to the config passed on the
command line (See also `GitLab!431`_, `GitLab651`_)

- Fix incorrect handling of ``--extend-exclude`` by treating its values as
files (See also `GitLab!432`_, `GitLab653`_)

.. all links
.. _3.8.2 milestone:
 https://gitlab.com/pycqa/flake8/-/milestones/35

.. issue links
.. _GitLab567:
 https://gitlab.com/pycqa/flake8/issues/567
.. _GitLab651:
 https://gitlab.com/pycqa/flake8/issues/651
.. _GitLab653:
 https://gitlab.com/pycqa/flake8/issues/653

.. merge request links
.. _GitLab!428:
 https://gitlab.com/pycqa/flake8/merge_requests/428
.. _GitLab!429:
 https://gitlab.com/pycqa/flake8/merge_requests/429
.. _GitLab!431:
 https://gitlab.com/pycqa/flake8/merge_requests/431
.. _GitLab!432:
 https://gitlab.com/pycqa/flake8/merge_requests/432

Links

• PyPI: https://pypi.org/project/flake8
• Changelog: https://pyup.io/changelogs/flake8/
• Repo: https://gitlab.com/pycqa/flake8

[pyup-bot]

Closing this in favor of #340