Log Message:
Update ibus-anthy to 1.5.6.

* Fixed deprecated GtkHBox, GtkVBox and GtkStock since GTK+ 3.10.
* Fixed deprecated warnings with python3-gobject 3.13.3.
* Set max-width-chars property in ibus-anthy-setup wrapped GtkLabel.
* Set a parent window from 'IBUS_SETUP_XID' environment variable in setup.
* Replare FileNotFoundError with IOError for python2 compatibility. (#1736)
* Changed fequency 500 to 0.
* Added Emoji dictionary.
* Set preview_lines to -1 in zip code.
* Added search entry in view dictionary dialog.
* Fixed Gtk.SearchEntry.search-changed signal for gtk 3.8.