Remove Python GI API version warnings

- reported in Clock-19 testing.

src/sugar3/speech.py

@@ -18,6 +18,9 @@ import os
 import logging
 from gettext import gettext as _
 
+import gi
+gi.require_version('Gtk', '3.0')
+
 from gi.repository import Gio
 from gi.repository import Gtk
 from gi.repository import Gdk
@@ -25,6 +28,7 @@ from gi.repository import GObject
 
 _HAS_GST = True
 try:
+    gi.require_version('Gst', '1.0')
     from gi.repository import Gst
     Gst.init(None)
     Gst.parse_launch('espeak')