v0.9

Added

• CLI: allow multiple notes in subcommands delete, done, edit, postpone,
  show, unarchive.
• Restored ff-qt -- experimental Qt GUI -- with minimal set of features.
  • Show agenda.
  • Postpone.
• Added сolorized output.

Changed

• Show useful message when nothing to show.
• Use modern prettyprinter.

Removed

• ff-serve