run black over stubs, add checking to travis

django-stubs-generated/contrib/sessions/backends/base.pyi

@@ -17,13 +17,9 @@ class SessionBase:
     def __init__(self, session_key: Optional[str] = ...) -> None: ...
     def __contains__(self, key: str) -> bool: ...
     def __getitem__(self, key: str) -> Union[Model, int, str]: ...
-    def __setitem__(
-        self, key: str, value: Union[datetime, Model, int, str]
-    ) -> None: ...
+    def __setitem__(self, key: str, value: Union[datetime, Model, int, str]) -> None: ...
     def __delitem__(self, key: str) -> None: ...
-    def get(
-        self, key: str, default: Optional[str] = ...
-    ) -> Optional[Union[datetime, int, str]]: ...
+    def get(self, key: str, default: Optional[str] = ...) -> Optional[Union[datetime, int, str]]: ...
     def pop(self, key: str, default: Any = ...) -> Union[int, str]: ...
     def setdefault(self, key: str, value: str) -> str: ...
     def set_test_cookie(self) -> None: ...

django-stubs-generated/contrib/sessions/backends/db.pyi

@@ -5,7 +5,6 @@ from django.contrib.sessions.base_session import AbstractBaseSession
 from django.contrib.sessions.models import Session
 from django.db.models.base import Model
 
-
 class SessionStore(SessionBase):
     accessed: bool
     serializer: Type[django.core.signing.JSONSerializer]
@@ -17,9 +16,7 @@ class SessionStore(SessionBase):
     def exists(self, session_key: Optional[str]) -> bool: ...
     modified: bool = ...
     def create(self) -> None: ...
-    def create_model_instance(
-        self, data: Dict[str, Model]
-    ) -> AbstractBaseSession: ...
+    def create_model_instance(self, data: Dict[str, Model]) -> AbstractBaseSession: ...
     def save(self, must_create: bool = ...) -> None: ...
     def delete(self, session_key: Optional[str] = ...) -> None: ...
     @classmethod

django-stubs-generated/contrib/sessions/backends/file.pyi

@@ -2,7 +2,6 @@ from typing import Any, Dict, Optional, Union
 
 from django.contrib.sessions.backends.base import SessionBase
 
-
 class SessionStore(SessionBase):
     accessed: bool
     serializer: Type[django.core.signing.JSONSerializer]

django-stubs-generated/contrib/sessions/backends/signed_cookies.pyi

@@ -3,7 +3,6 @@ from typing import Any, Dict, Optional, Union
 
 from django.contrib.sessions.backends.base import SessionBase
 
-
 class SessionStore(SessionBase):
     accessed: bool
     serializer: Type[django.core.signing.JSONSerializer]