v0.4

• Added a new option: min_notification_delay. It represents a minimal delay
  between successive notifications from the same buffer. It is used to protect
  from floods/spam. The default value is 500 milliseconds. Set it to 0 to
  disable this feature (i.e. all notifications will be shown).
• Added a new option: notify_on_highlights. It allows you to disable
  notifications on highlights. By default, notifications on highlights are
  enabled.
• Added a new option: notify_on_privmsgs. It allows you to disable
  notifications on private messages. By default, notifications on private
  messages are enabled.