Bump pyflakes from 2.0.0 to 2.1.1

[dependabot-preview[bot]]

Bumps pyflakes from 2.0.0 to 2.1.1.

Changelog

Sourced from pyflakes's changelog.

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](https://github.com/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

Commits

• 6501af4 Release 2.1.1
• ba64624 Fix line number of comment syntax error message (#420)
• 2c29431 Fix typing.overload check to only check imported names (#423)
• 72bf8cc Fix appveyor build
• 4bc1f21 Write changelog and bump version for 2.1.0
• 65fdfad Fix regression with __all__ = [not, strings]
• 14f28ba Use file_tokens to better match flake8 api
• 357a2e3 Allow star args in type comments
• 7272b10 Add check for use of 'is' operator with str, bytes, and int literals
• 1f58890 Set the proper scope for async def
• Additional commits viewable in compare view

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