changed drinks list for demo

ps-grammar/object/object.jsgf

@@ -5,7 +5,7 @@ public <statement> = [<verb>] [<article>] <object> [please];
 <object> = <grab_object>;
 <grab_object> = <cleaning_class> | <drink_class> | <snack_class> | <food_class> | tool | (bathroom stuff) | (cleaning stuff) | drinks | snacks | object | food | something | stuff | item | beverage | things;
 <cleaning_class> = brush | detergent | shampoo | sponge | toothpaste;
-<drink_class> = (orange juice) | beer | cola | (chocolate milk) | (energy drink) | (grape juice) | milk | water;
+<drink_class> = (energy drink) | milk | coffee;
 <snack_class> = (chocolate cookies) | chips | biscuits | bread | pringles | (strawberry cookies);
 <food_class> = (baby food) | crackers | coffee | yeast | noodles | beans;