run black over stubs, add checking to travis

django-stubs-generated/contrib/auth/management/__init__.pyi

@@ -3,14 +3,8 @@ from typing import Any, Optional
 from django.apps.config import AppConfig
 from django.apps.registry import Apps
 
-
 def create_permissions(
-    app_config: AppConfig,
-    verbosity: int = ...,
-    interactive: bool = ...,
-    using: str = ...,
-    apps: Apps = ...,
-    **kwargs: Any
+    app_config: AppConfig, verbosity: int = ..., interactive: bool = ..., using: str = ..., apps: Apps = ..., **kwargs: Any
 ) -> None: ...
 def get_system_username() -> str: ...
 def get_default_username(check_db: bool = ...) -> str: ...

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]]: ...