[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

dargs/dargs.py

@@ -25,6 +25,7 @@
 from enum import Enum
 from textwrap import indent
 from typing import Any, Callable, Dict, Iterable, List, Optional, Union
+
 try:
     from typing import get_origin
 except ImportError: