run black over stubs, add checking to travis

django-stubs-generated/contrib/auth/management/commands/createsuperuser.pyi

@@ -3,7 +3,6 @@ from typing import Any, Optional, Union
 from django.core.management.base import BaseCommand, CommandParser
 from django.db.models.fields import Field
 
-
 class NotRunningInTTYException(Exception): ...
 
 class Command(BaseCommand):
@@ -20,6 +19,4 @@ class Command(BaseCommand):
     stdin: Any = ...
     def execute(self, *args: Any, **options: Any) -> None: ...
     def handle(self, *args: Any, **options: Any) -> None: ...
-    def get_input_data(
-        self, field: Field, message: str, default: Optional[str] = ...
-    ) -> Optional[Union[int, str]]: ...
+    def get_input_data(self, field: Field, message: str, default: Optional[str] = ...) -> Optional[Union[int, str]]: ...