version 3.17.1

Changes

• #1221 Use 125 chars for max line length for both flake8 and black - Thanks @seratch
• #1223 Improve the installation data queries to always return the latest bot token - Thanks @seratch
• #1226 Upgrade pytype to the latest - Thanks @seratch
• #1225 Update the maintainers guide - Thanks @WilliamBergamin

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• All issues/pull requests: https://github.com/slackapi/python-slack-sdk/milestone/60?closed=1
• All changes: v3.17.0...v3.17.1