Added more Airship Dragoon.

index.html

@@ -141,6 +141,8 @@ $(document).ready(function() {
     20: 'Deathball Desert (demo) by GarageGames',
     21: 'Deathball Desert (demo) by GarageGames',
     22: 'Mars (demo) by GarageGames',
+    23: 'Airship Dragoon by YorkshireRifes',
+    24: 'Airship Dragoon by YorkshireRifes',
   };
 
   function shuffle(o) {