run black over stubs, add checking to travis

django-stubs-generated/contrib/flatpages/forms.pyi

@@ -3,7 +3,6 @@ from typing import Any, Dict, Optional, Union
 from django import forms
 from django.db.models.query import QuerySet
 
-
 class FlatpageForm(forms.ModelForm):
     auto_id: str
     data: Dict[str, Union[List[int], str]]

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

@@ -4,9 +4,6 @@ from django.core.handlers.wsgi import WSGIRequest
 from django.http.response import HttpResponse
 from django.utils.deprecation import MiddlewareMixin
 
-
 class FlatpageFallbackMiddleware(MiddlewareMixin):
     get_response: Callable
-    def process_response(
-        self, request: WSGIRequest, response: HttpResponse
-    ) -> HttpResponse: ...
+    def process_response(self, request: WSGIRequest, response: HttpResponse) -> HttpResponse: ...

django-stubs-generated/contrib/flatpages/models.pyi

@@ -2,7 +2,6 @@ from typing import Any, Optional
 
 from django.db import models
 
-
 class FlatPage(models.Model):
     id: None
     url: str = ...

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

@@ -3,6 +3,5 @@ from typing import Optional
 from django.contrib.sitemaps import Sitemap
 from django.db.models.query import QuerySet
 
-
 class FlatPageSitemap(Sitemap):
     def items(self) -> QuerySet: ...

django-stubs-generated/contrib/flatpages/templatetags/flatpages.pyi

@@ -10,12 +10,7 @@ class FlatpageNode(template.Node):
     context_name: str = ...
     starts_with: None = ...
     user: None = ...
-    def __init__(
-        self,
-        context_name: str,
-        starts_with: Optional[str] = ...,
-        user: Optional[str] = ...,
-    ) -> None: ...
+    def __init__(self, context_name: str, starts_with: Optional[str] = ..., user: Optional[str] = ...) -> None: ...
     def render(self, context: Context) -> str: ...
 
 def get_flatpages(parser: Parser, token: Token) -> FlatpageNode: ...