Fixed spelling error

src/main/java/com/alttd/fishingevent/config/Messages.java

@@ -161,7 +161,7 @@ public class Messages extends AbstractConfig {
         @SuppressWarnings("unused")
         private static void load() {
             NEW_LEADER = config.getString(prefix, "new-leader", NEW_LEADER);
-            PURCHASED_UPGRADE = config.getString(prefix, "pruchased-upgrade", PURCHASED_UPGRADE);
+            PURCHASED_UPGRADE = config.getString(prefix, "purchased-upgrade", PURCHASED_UPGRADE);
         }
     }