feat:增加只做maker

@@ -84,6 +84,10 @@ class Order
             $ordType = "LIMIT";
             $timeInForce = $this->ordType;
         }
+        if ($this->ordType == "ONLYMAKER") {
+            $ordType = "LIMIT";
+            $timeInForce = "GTX";
+        }
         $order = [
             'symbol' => $symbol,
             'positionSide' => $this->posSide,