require Gtk and Gdk version 3.0 in asyncpk1.py

Author: zdohnal

asyncpk1.py

@@ -22,7 +22,9 @@
 import dbus
 from functools import reduce
 try:
+    gi.require_version('Gdk', '3.0')
     from gi.repository import Gdk
+    gi.require_version('Gtk', '3.0')
     from gi.repository import Gtk
 except:
     pass