fix Duels.prestige returns Classic Godlike undefined

Author: StavZ

src/structures/MiniGames/Duels.js

@@ -12,7 +12,12 @@ const numerals = {
   2: 'II',
   3: 'III',
   4: 'IV',
-  5: 'V'
+  5: 'V',
+  6: 'VI',
+  7: 'VII',
+  8: 'VIII',
+  9: 'IX',
+  10: 'X'
 };
 /**
  * @param {object} data