Bump pyflakes from 1.1.0 to 2.2.0

[dependabot-preview]

Bumps pyflakes from 1.1.0 to 2.2.0.

Changelog

Sourced from pyflakes's changelog.

2.2.0 (2020-04-08)

• Include column information in error messages
• Fix @overload detection with other decorators and in non-global scopes
• Fix return-type annotation being a class member
• Fix assignment to _ in doctests with existing _ name
• Namespace attributes which are attached to ast nodes with _pyflakes_ to avoid conflicts with other libraries (notably bandit)
• Add check for f-strings without placeholders
• Add check for unused/extra/invalid 'string literal'.format(...)
• Add check for unused/extra/invalid 'string literal % ...
• Improve python shebang detection
• Allow type ignore to be followed by a code # type: ignore[attr-defined]
• Add support for assignment expressions (PEP 572)
• Support @overload detection from typing_extensions as well
• Fix @overload detection for async functions
• Allow continue inside finally in python 3.8+
• Fix handling of annotations in positional-only arguments
• Make pyflakes more resistant to future syntax additions
• Fix false positives in partially quoted type annotations
• Warn about is comparison to tuples
• Fix Checker usage with async function subtrees
• Add check for if of non-empty tuple
• Switch from optparse to argparse
• Fix false positives in partially quoted type annotations in unusual contexts
• Be more cautious when identifying Literal type expressions

2.1.1 (2019-02-28)

• Fix reported line number for type comment errors
• Fix typing.overload check to only check imported names

2.1.0 (2019-01-23)

• Allow intentional assignment to variables named _
• Recognize __module__ as a valid name in class scope
• pyflakes.checker.Checker supports checking of partial ast trees
• Detect assign-before-use for local variables which shadow builtin names
• Detect invalid print syntax using >> operator
• Treat async for the same as a for loop for introducing variables
• Add detection for list concatenation in __all__
• Exempt @typing.overload from duplicate function declaration
• Importing a submodule of an as-aliased import-import is marked as used
• Report undefined names from __all__ as possibly coming from a * import
• Add support for changes in Python 3.8-dev
• Add support for PEP 563 (from __future__ import annotations)
• Include Python version and platform information in pyflakes --version
• Recognize __annotations__ as a valid magic global in Python 3.6+
• Mark names used in PEP 484 # type: ... comments as used
• Add check for use of is operator with str, bytes, and int literals

... (truncated)

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[dependabot-preview]

Superseded by #119.