Add regulation mark (#17)

* Added to interface

* Added Regulation mark to all current cards

* Ready for merge

data/Sword & Shield/Battle Styles/138.ts

@@ -16,7 +16,9 @@ const card: Card = {
 	effect: {
 		en: "The Retreat Cost of each Rapid Strike Pokémon in play (both yours and your opponent’s) is ColorlessColorless less.",
 		fr: "Le Coût de Retraite de chaque Pokémon Mille Poings en jeu (les vôtres et ceux de votre adversaire) est diminué de ColorlessColorless."
-	}
+	},
+
+	regulationMark: "E"
 }
 
 export default card