feat:增加调整杠杆

@@ -231,6 +231,12 @@ class BinanceSpot
         $method = 'GET';
         return $this->requestAccount($method, $path, $param);
     }
+    //调整全仓最大杠杆 (USER_DATA)
+    public function maxLeverageMargin($param){
+        $path = '/sapi/v1/margin/max-leverage';
+        $method = 'POST';
+        return $this->requestAccount($method, $path, $param);
+    }
 
     /*
      * ==================================