Bump pyflakes from 2.1.1 to 2.2.0

Bumps pyflakes from 2.1.1 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

Commits

• c72d6cf Release 2.2.0
• c688d2b Fix pyflakes for removal of ast.Param (#523)
• 684f14d Be more cautious when identifying typing Literal (#517)
• 7641643 Fix quoted type annotations in unusual contexts (#516)
• ef3c5cb Deprecate optparse in favor of argparse (#499)
• 598eb16 Add a check for if statement conditions which are non-empty tuples (#512)
• 38ee670 Clarify message docstring (#522)
• 780bdcd Fix bug in async function scope checking (#511)
• 0af480e Warn about is comparison to tuple (#484)
• c9708a1 Fix false positive with partially quoted annotations (#479)
• Additional commits viewable in compare view