更改app支付 package签名

go/gopath/src/fohow.com/libs/wx_mp/pay.go

@@ -193,7 +193,7 @@ func getAppPayPrepayId(outTradeNo string, totalPrice int64, body, notifyUrl, rem
 		"notify_url":       notifyUrl,
 		// "product_id":       outTradeNo,
 		"trade_type": "APP",
-		// "limit_pay":  "no_credit",
+		"package":    "Sign=WXPay",
 	}
 
 	beego.BeeLogger.Warn("mechantInfo err[%s]", mechantInfo.MchId)