#957 修改微信支付退款响应类的cash_refund_fee字段类型为Integer

weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/result/WxPayRefundResult.java

@@ -90,10 +90,10 @@ public class WxPayRefundResult extends BaseWxPayResult implements Serializable {
   private String cashFeeType;
 
   /**
-   * 现金退款金额.
+   * 现金退款金额，单位为分，只能为整数，详见支付金额.
    */
   @XStreamAlias("cash_refund_fee")
-  private String cashRefundFee;
+  private Integer cashRefundFee;
 
   /**
    * 退款代金券使用数量.