version upgrade to 1.7.3

weixin4j-base/src/main/java/com/foxinmy/weixin4j/payment/WeixinPayProxy.java

@@ -859,5 +859,5 @@ public class WeixinPayProxy {
 		return customsApi.queryCustomsOrder(idQuery, customsCity);
 	}
 
-	public final static String VERSION = "1.7.2";
+	public final static String VERSION = "1.7.3";
 }

weixin4j-base/src/main/java/com/foxinmy/weixin4j/type/mch/RefundAccountType.java

@@ -0,0 +1,18 @@
+package com.foxinmy.weixin4j.type.mch;
+
+/**
+ * 退款资金来源
+ * @className RefundAccountType
+ * @author jinyu(foxinmy@gmail.com)
+ * @date 2016年12月12日
+ */
+public enum RefundAccountType {
+	/**
+	 * ---未结算资金退款（默认使用未结算资金退款）
+	 */
+	REFUND_SOURCE_UNSETTLED_FUNDS,
+	/**
+	 * ---可用余额退款
+	 */
+	REFUND_SOURCE_RECHARGE_FUNDS
+}