update Discount

Author: wangzunjiao

src/main/java/com/alipay/global/api/model/ams/Discount.java

@@ -11,7 +11,9 @@
 @AllArgsConstructor
 public class Discount {
 
+    private String discountTag;
     private String discountName;
     private Amount savingsAmount;
+    private Amount estimateSavingsAmount;
 
 }