• #431: Add "working_directory" option to support source directories with relative paths.
• #444: When loading a configuration file that is unreadable due to file permissions, warn instead
  of erroring. This supports running borgmatic as a non-root user with configuration in ~/.config
  even if there is an unreadable global configuration file in /etc.
• #469: Add "repositories" context to "before_" and "after_" command action hooks. See the
  documentation for more information:
  https://torsion.org/borgmatic/docs/how-to/add-preparation-and-cleanup-steps-to-backups/
• #486: Fix handling of "patterns_from" and "exclude_from" options to error instead of warning when
  referencing unreadable files and "create" action is run.
• #507: Fix Borg usage error in the "compact" action when running "borgmatic --dry-run". Now, skip
  "compact" entirely during a dry run.