coke in drinks

ps-grammar/object/drinks.jsgf

@@ -4,7 +4,7 @@ public <statement> = [<verb>] [<article>] <objects> [please];
 
 <objects> = <object>;
 <object> = <drink_class>;
-<drink_class> = (energy drink) | milk | coffee;
+<drink_class> = (energy drink) | milk | coffee | coke;
 
 <verb> = (bring me) | bring | carry | retrieve | fetch | get | (get me) | give | find | search for | put | learn | remember | memorize;
 <article> = the | an | some | a | this;