run black over stubs, add checking to travis

django-stubs-generated/contrib/sitemaps/__init__.pyi

@@ -21,10 +21,7 @@ class Sitemap:
     @property
     def paginator(self) -> Paginator: ...
     def get_urls(
-        self,
-        page: Union[int, str] = ...,
-        site: Optional[Union[Site, RequestSite]] = ...,
-        protocol: Optional[str] = ...,
+        self, page: Union[int, str] = ..., site: Optional[Union[Site, RequestSite]] = ..., protocol: Optional[str] = ...
     ) -> List[Dict[str, Optional[Union[datetime, Model, str]]]]: ...
 
 class GenericSitemap(Sitemap):

django-stubs-generated/contrib/sitemaps/management/commands/ping_google.pyi

@@ -2,7 +2,6 @@ from typing import Any, Optional
 
 from django.core.management.base import BaseCommand, CommandParser
 
-
 class Command(BaseCommand):
     stderr: django.core.management.base.OutputWrapper
     stdout: django.core.management.base.OutputWrapper

django-stubs-generated/contrib/sitemaps/views.pyi

@@ -5,7 +5,6 @@ from django.contrib.sitemaps import GenericSitemap, Sitemap
 from django.core.handlers.wsgi import WSGIRequest
 from django.template.response import TemplateResponse
 
-
 def x_robots_tag(func: Callable) -> Callable: ...
 def index(
     request: WSGIRequest,
@@ -16,9 +15,7 @@ def index(
 ) -> TemplateResponse: ...
 def sitemap(
     request: WSGIRequest,
-    sitemaps: Union[
-        Dict[str, Type[Sitemap]], Dict[str, GenericSitemap], OrderedDict
-    ],
+    sitemaps: Union[Dict[str, Type[Sitemap]], Dict[str, GenericSitemap], OrderedDict],
     section: Optional[str] = ...,
     template_name: str = ...,
     content_type: str = ...,