3.6.2

- gui now configurable per rank
- fix item requirement

src/main/java/sh/okx/rankup/util/ItemUtil.java

@@ -1,24 +1,22 @@
 package sh.okx.rankup.util;
 
-import com.google.common.base.Suppliers;
-import java.util.function.Supplier;
 import org.bukkit.Material;
 
 public class ItemUtil {
-  private static Supplier<Boolean> flattenedSupplier = Suppliers.memoize(ItemUtil::isServerFlattenedPrivate);
+  private static boolean flattened;
 
-  private static boolean isServerFlattenedPrivate() {
+  static {
     try {
       Material.valueOf("BLACK_STAINED_GLASS_PANE");
-      return true;
+      flattened = true;
     } catch (IllegalArgumentException e) {
-      return false;
+      flattened = false;
     }
   }
 
   /**
    * Determines if a server is post-flattening or pre-flattening.
-   * The flattening is the name for a process where, instead of using durability to represent
+   * The flattening is the name for the event where, instead of using durability to represent
    * similar items, Mojang decided to use distinct item types for each item.
    * This caused many {@link Material} names to change, making some things incompatible.
    * The flattening happened in 1.13.
@@ -26,6 +24,6 @@ public class ItemUtil {
    * @return true if the server is post-flattening (server versions 1.13, 1.14, 1.15) or false if it is pre-flattening (1.12, 1.11, 1.10 etc)
    */
   public static boolean isServerFlattened() {
-    return flattenedSupplier.get();
+    return flattened;
   }
 }