fix for 3.9

Author: Zomatree

revolt/ext/commands/command.py

@@ -3,7 +3,6 @@
 import inspect
 import traceback
 from contextlib import suppress
-from types import NoneType
 from typing import (TYPE_CHECKING, Annotated, Any, Callable, Coroutine,
                     Literal, Optional, Union, get_args, get_origin, cast)
 
@@ -21,6 +20,9 @@
     "command"
 )
 
+NoneType = type(None)
+
+
 class Command:
     """Class for holding info about a command.