Bump flake8 from 3.8.2 to 3.8.3

Created by: dependabot-preview[bot]

Bumps flake8 from 3.8.2 to 3.8.3.

Commits

• 181bb46 Release 3.8.3
• 3d68da9 Merge branch 'doctests-flag-desc' into 'master'
• e817c63 Help clarify the option behaviour
• b6d3fca Merge branch 'issues/665' into 'master'
• 9b8f908 fix JobsArgument --help output
• 94304de Merge branch 'issue-662' into 'master'
• a68d4d0 processor: Catch SyntaxError also when generating tokens for a file
• See full diff in compare view

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