Released 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.