[Bleeding] Cleanup clone methods.

By: Wesley Wolfe <weswolf@aol.com>

paper-api/src/main/java/org/bukkit/material/Rails.java

@@ -149,4 +149,9 @@ public class Rails extends MaterialData {
             break;
         }
     }
+
+    @Override
+    public Rails clone() {
+        return (Rails) super.clone();
+    }
 }