borgmatic 1.6.6

• #559: Update documentation about configuring multiple consistency checks or multiple databases.
• #560: Fix all database hooks to error when the requested database to restore isn't present in the
  Borg archive.
• #561: Fix command-line "--override" flag to continue supporting old configuration file formats.
• #563: Fix traceback with "create" action and "--json" flag when a database hook is configured.