make pep561 compliant

django-stubs/db/models/sql/query.pyi

@@ -0,0 +1,22 @@
+from django.db.models.base import Model
+from django.db.models.sql.where import WhereNode
+from typing import (
+    Set,
+    Tuple,
+    Type,
+    Union,
+)
+
+
+class JoinPromoter:
+    def __init__(self, connector: str, num_children: int, negated: bool) -> None: ...
+    def add_votes(self, votes: Union[Set[str], Tuple]) -> None: ...
+    def update_join_types(self, query: Query) -> Set[str]: ...
+
+
+class Query:
+    def __init__(
+        self,
+        model: Type[Model],
+        where: Type[WhereNode] = ...
+    ) -> None: ...