feat：杠杆账户接口

@@ -203,6 +203,37 @@ class BinanceSpot
 
     /*
      * ==================================
+     * 以下杠杆账户接口
+     * ==================================
+     */
+    //杠杆账户生成 Listen Key (USER_STREAM)
+    public function  listenKeyMargin($param)
+    {
+        $path = '/sapi/v1/userDataStream';
+        $method = 'POST';
+        return $this->requestListenKey($method, $path, $param);
+    }
+    //杠杆账户下单
+    public function orderMargin($param){
+        $path = '/sapi/v1/margin/order';
+        $method = 'POST';
+        return $this->requestAccount($method, $path, $param);
+    }
+    //杠杆账户撤销订单 (TRADE)
+    public function cancelOrderMargin($param){
+        $path = '/sapi/v1/margin/order';
+        $method = 'DELETE';
+        return $this->requestAccount($method, $path, $param);
+    }
+    //杠杆账户订单列表
+    public function openOrdersMargin($param){
+        $path = '/sapi/v1/margin/openOrders';
+        $method = 'GET';
+        return $this->requestAccount($method, $path, $param);
+    }
+
+    /*
+     * ==================================
      * 以下公共接口，无限apikey
      * ==================================
      */