Log Message:
mikutter: update to 3.7.1.

pkgsrc changes:

* add MESSAGE file that describes how to use Twitter via mikutter
  even after mikutter's Twitter API keys have been suspended
* explicitly require updated ruby-gnome2-glib 3.2.5nb1

Upstream changes:

mikutter 3.7.1

* crashed on showing system messages in some case

mikutter 3.7.0

* Score
 * custom emoji
* change a cursor shape on clickable elements on timeline
 * thanks Yuto Tokunaga
* stop auto scroll when mouse-over icon buttons are shown
 * @cobodo
* improve an open file dialog
 * @cobodo
* Photo Variant
* provide a simpler method to replace Twitter's consumer key