v0.24.0

Added

• Add Python 3.10 support

Changed

• Bump redis from 3.5.3 to 4.0.2 (#512 #513)
• Bump apscheduler from 3.8.0 to 3.8.1 (#507)
• Move documentation from Sphinx to MkDocs and Material for MkDocs
  for beautiful docs (#514)
• Switch from slackclient to slack_sdk library, fixes #443

Removed

• Breaking: Remove Python 3.6 support

Full Changelog: v0.23.2...v0.24