Ignore case.

src/main/java/com/songoda/epicenchants/managers/Manager.java

@@ -15,7 +15,11 @@ public abstract class Manager<K, V> {
     }
 
     public Optional<V> getValue(K key) {
-        return Optional.ofNullable(map.get(key));
+        for (Object k : map.keySet()) {
+            if (k.toString().equalsIgnoreCase(key.toString()))
+                return Optional.ofNullable(map.get(k));
+        }
+        return Optional.empty();
     }
 
     public void add(K key, V value) {

src/main/resources/enchants/unique/FeatherWeight.yml

@@ -13,13 +13,13 @@ description:
 
 # What items this enchant can be applied to.
 item-whitelist:
-  - "SWORDS"
+  - "TOOLS"
 
 # For a full list of effects, please visit: https://wiki.songoda.com/display/SON/EpicEnchants
 effects:
   POTION:
     # The trigger that will fire this effect
-    trigger: "ATTACK_PLAYER_MELEE, ATTACK_MOB_MELEE"
+    trigger: "BLOCK_BREAK"
     # Potion Effect that should be applied.
     potion-type: FAST_DIGGING
     # Amplifier of 0 = SPEED 1 a Amplifier of 1 = SPEED 2, etc.