fix: Upbit.get_closed_orders 메소드에서 state 기본값을 불필요하게 지정한 문제 수정

Author: designmeme

upbit/upbit.py

@@ -600,7 +600,7 @@ def get_open_orders(self,
     def get_closed_orders(self,
                           *,
                           market: Optional[str] = None,
-                          state: ClosedOrderState = 'done',
+                          state: ClosedOrderState | None = None,
                           states: Optional[List[ClosedOrderState]] = None,
                           start_time: Optional[str] = None,
                           end_time: Optional[str] = None,