Version 2.2.0

Features:

• #119 - Added a new --fetch/--no-fetch option for local scans, controlling
  whether the local clone is refreshed before scan. (Thanks @jgowdy!)
• #125 - Implement CODEOWNERS and auto-assignment to maintainers on PRs

Bugfixes:

• #115 - Strange behavior can manifest with invalid sub-commands
• #117 - Ignore whitespace-only lines in exclusion files
• #118 - Local scans fetch remote origin
• #121 - Match rules specified with --git-rules-repo were not included in scans
• #140 - Ensure a valid output folder name in Windows

Other changes:

• #95 - Run CI across Linux, Windows, and MacOS
• #130 - Added references to Tartufo GoogleGroups mailing list to docs
• Fixed testing in Pypy3 and explicitly added Python 3.9 support
• #134 - Documented the release process
• #143 - Updated GitHub Action hashes to newest rev to address https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/ where possible