run black over stubs, add checking to travis

django-stubs-generated/contrib/admindocs/middleware.pyi

@@ -4,13 +4,8 @@ from django.core.handlers.wsgi import WSGIRequest
 from django.http.response import HttpResponse
 from django.utils.deprecation import MiddlewareMixin
 
-
 class XViewMiddleware(MiddlewareMixin):
     get_response: None
     def process_view(
-        self,
-        request: WSGIRequest,
-        view_func: Callable,
-        view_args: Tuple,
-        view_kwargs: Dict[Any, Any],
+        self, request: WSGIRequest, view_func: Callable, view_args: Tuple, view_kwargs: Dict[Any, Any]
     ) -> Optional[HttpResponse]: ...