feat:获取bn所有杠杆

@@ -97,7 +97,7 @@ class ExBroker
         return $res;
     }
     //获取所有账户杠杆
-    public function getAllLeverage()
+    public function getAllLevers()
     {
         $res = $this->api->getPositionRiskV2([]);
         $retArr = [];