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.

changelog.md

@@ -15,6 +15,7 @@ These changes will (most likely) be included in the next version.
 - Unbreakable weapons and armor now use the unbreakable item flag instead of item durability and on-hit repairs. This means that MobArena's unbreakable items are now compatible with plugins that depend on special durability values, such as QualityArmory. 
 - Spectators can no longer take damage when the arena isn't running.
 - Pets can now teleport back to their owners if they get too far away.
+- Enchantment names are now case insensitive (i.e. `FIRE_PROTECTION` is the same as `fire_protection`).
 
 ## [0.103] - 2018-08-28
 - It is now possible to add a fixed delay (in seconds) between waves with the new per-arena setting `next-wave-delay`.

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()));
     }
 }