Update flake8 to 3.8.4

[pyup-bot]

This PR updates flake8 from 3.8.3 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

Links

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

[codecov-commenter]

Codecov Report

Merging #1349 into master will increase coverage by 25.62%.
The diff coverage is 97.39%.

@@             Coverage Diff             @@
##           master    #1349       +/-   ##
===========================================
+ Coverage   58.36%   83.99%   +25.62%     
===========================================
  Files           9       48       +39     
  Lines         233      681      +448     
===========================================
+ Hits          136      572      +436     
- Misses         97      109       +12     

Impacted Files	Coverage Δ
pypro/modulos/apps.py	0.00% <0.00%> (ø)
pypro/turmas/apps.py	0.00% <0.00%> (ø)
pypro/urls.py	71.42% <ø> (ø)
pypro/modulos/migrations/0003_populando_slug.py	80.00% <80.00%> (ø)
pypro/settings.py	65.21% <90.00%> (+4.20%)	⬆️
pypro/aperitivos/models.py	90.90% <90.90%> (ø)
pypro/modulos/models.py	92.30% <92.30%> (ø)
pypro/aperitivos/admin.py	100.00% <100.00%> (ø)
pypro/aperitivos/migrations/0001_initial.py	100.00% <100.00%> (ø)
...o/aperitivos/migrations/0002_auto_20190910_0940.py	100.00% <100.00%> (ø)
... and 75 more

---

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[pyup-bot]

Closing this in favor of #1628