Log Message:
Update mikutter to 0.0.3.8.

* Improvements
  * Add notification related events.  Add following plugins
    * alsa - plugin for playing sound with alsa.
    * libnotify - plugin for notify with libnotify.

* Fixes
  * crash at limiting.
  * included JSON library is too old.
  * defect that settings may not be saved correctly.
  * defect that link position move over.
  * some API cache functions.
  * defect of crash at editing shorcut key.