Make enchantments case insensitive.

Lowercasing the enchantment string before feeding it to the Bukkit API makes the enchantments a little more "copy/paste proof" when grabbing the uppercased names from the JavaDocs/Minecraft wiki.

src/main/java/com/garbagemule/MobArena/util/ItemParser.java

@@ -160,6 +160,6 @@ public class ItemParser
     }
 
     private static Enchantment getEnchantment(String ench) {
-        return Enchantment.getByKey(NamespacedKey.minecraft(ench));
+        return Enchantment.getByKey(NamespacedKey.minecraft(ench.toLowerCase()));
     }
 }