fix typo

Author: hhxsv5

tests/OrderTest.php

@@ -142,7 +142,7 @@ public function testGetDetail(Order $api, array $orders)
             $this->assertArrayHasKey('feeCurrency', $order);
             $this->assertArrayHasKey('remark', $order);
             $this->assertArrayHasKey('type', $order);
-            $this->assertArrayHasKey('iceberge', $order);
+            $this->assertArrayHasKey('iceberg', $order);
             $this->assertArrayHasKey('createdAt', $order);
             $this->assertArrayHasKey('visibleSize', $order);
             $this->assertArrayHasKey('price', $order);