* btrbk-0.10
  - initial revision

* btrbk-0.11
  - added option -p (preserve backups)
  - added optional subvolume argument for run/dryrun actions, for
    explicit selection of subvolumes to be processed
  - bugfixes

* btrbk-0.12
  - cleaner and more generic parsing of btrfs subvolume list
  - bugfix: subvolumes are also allowed for "snapshot_dir" (fixes
    issues #1, #2)

* btrbk-current
  - bugfix: allow '@' character for subvolume names (ubuntu prefixes
    all subvolumes with '@' in its subvolume layout)