make pep561 compliant

django-stubs/contrib/messages/storage/fallback.pyi

@@ -0,0 +1,24 @@
+from django.contrib.messages.storage.base import Message
+from django.http.response import HttpResponse
+from typing import (
+    Any,
+    List,
+    Tuple,
+    Union,
+)
+
+
+class FallbackStorage:
+    def __init__(self, *args, **kwargs) -> None: ...
+    def _get(
+        self,
+        *args,
+        **kwargs
+    ) -> Union[Tuple[List[Any], bool], Tuple[List[str], bool], Tuple[List[Message], bool]]: ...
+    def _store(
+        self,
+        messages: List[Message],
+        response: HttpResponse,
+        *args,
+        **kwargs
+    ) -> List[Any]: ...