Bump flake8 from 3.7.9 to 3.8.1

Created by: dependabot-preview[bot]

Bumps flake8 from 3.7.9 to 3.8.1.

Commits

• f94e009 Release 3.8.1
• 00985a6 Merge branch 'issue638-ouput-file' into 'master'
• e6d8a90 options: Forward --output-file to be reparsed for BaseFormatter
• b4d2850 Release 3.8.0
• 03c7dd3 Merge branch 'exclude_dotfiles' into 'master'
• 9e67511 Fix using --exclude=.* to not match . and ..
• 6c4b5c8 Merge branch 'linters_py3' into 'master'
• 309db63 switch dogfood to use python3
• 8905a7a Merge branch 'logical_position_out_of_bounds' into 'master'
• 609010c Fix logical checks which report position out of bounds
• Additional commits viewable in compare view

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