Update HeadDatabaseAPI.java

Author: Brennian

src/main/java/me/arcaniax/hdb/api/HeadDatabaseAPI.java

@@ -30,6 +30,10 @@
 import org.bukkit.block.Block;
 import org.bukkit.inventory.ItemStack;
 
+import java.util.ArrayList;	
+import java.util.List;	
+import java.util.UUID;
+
 public class HeadDatabaseAPI {
 
     /**