Replace kill() on recommendation of PVC, arcade author

JFincher42 · JFincher42 · commit 40d3d3b38171 · 2019-09-30T15:09:45.000-05:00
diff --git a/arcade-a-primer/arcade_game.py b/arcade-a-primer/arcade_game.py
@@ -29,7 +29,7 @@ def update(self):
 
         # Remove us if we're off screen
         if self.right < 0:
-            self.kill()
+            self.remove_from_sprite_lists()
 
 
 class SpaceShooter(arcade.Window):
