• #715: Add a monitoring hook for sending backup status to a variety of monitoring services via the
  Apprise library. See the documentation for more information:
  https://torsion.org/borgmatic/docs/how-to/monitor-your-backups/#apprise-hook
• #748: When an archive filter causes no matching archives for the "rlist" or "info"
  actions, warn the user and suggest how to remove the filter.
• #768: Fix a traceback when an invalid command-line flag or action is used.
• #771: Fix normalization of deprecated sections ("location:", "storage:", "hooks:", etc.) to
  support empty sections without erroring.
• #774: Disallow the "--dry-run" flag with the "borg" action, as borgmatic can't guarantee the Borg
  command won't have side effects.