Bump engine submodule.

game/game.py

@@ -49,6 +49,7 @@ def main():
 
     print("Initializing...")
     display = create_display(b'RK Island - Drag to rotate, wheel to zoom, q to quit', 1600, 900)
+    assert display
     events = Events(display)
     mouse = Mouse(events, wheel = 60, wheel_min = 20)
     keyboard = Keyboard(events)