Update pyflakes to 2.4.0

[pyup-bot]

This PR updates pyflakes from 2.2.0 to 2.4.0.

Changelog

2.4.0

- Remove unused tracing code (``traceTree``)
- Add support for ``match`` statement
- Detect ``typing`` module attributes when imported with ``import ... as ...``

2.3.1

- Fix regression in 2.3.0: type annotations no longer redefine imports

2.3.0

- Recognize tuple concatenation in ``__all__`` export definitions
- Better support use of annotation-only assignments when using
``from __future__ import annotations``
- Recognize special-case typing for ``Annotated``
- Fix undefined name ``__qualname__`` in class scope
- Recognize special-cased typing for ``TypeVar``
- Errors for undefined exports in ``__all__`` are shown in a deterministic order
- Fix false positives in certain typing constructs (``TypeVar``,
``NamedTuple``, ``TypedDict``, ``cast``)

Links

• PyPI: https://pypi.org/project/pyflakes
• Changelog: https://pyup.io/changelogs/pyflakes/
• Repo: https://github.com/PyCQA/pyflakes

[codecov]

Codecov Report

Merging #121 (1d3d59c) into master (b80bb2f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #121   +/-   ##
=======================================
  Coverage   96.12%   96.12%           
=======================================
  Files          12       12           
  Lines         129      129           
=======================================
  Hits          124      124           
  Misses          5        5           

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[pyup-bot]

Closing this in favor of #172