run black over stubs, add checking to travis

django-stubs-generated/core/cache/backends/db.pyi

@@ -2,7 +2,6 @@ from typing import Any, Callable, Dict, Optional, Union
 
 from django.core.cache.backends.base import BaseCache
 
-
 class Options:
     db_table: str = ...
     app_label: str = ...
@@ -22,40 +21,19 @@ class BaseDatabaseCache(BaseCache):
     key_prefix: str
     version: int
     cache_model_class: Any = ...
-    def __init__(
-        self,
-        table: str,
-        params: Dict[str, Union[Callable, Dict[str, int], int, str]],
-    ) -> None: ...
+    def __init__(self, table: str, params: Dict[str, Union[Callable, Dict[str, int], int, str]]) -> None: ...
 
 class DatabaseCache(BaseDatabaseCache):
     default_timeout: int
     key_func: Callable
     key_prefix: str
     version: int
-    def get(
-        self,
-        key: str,
-        default: Optional[Union[int, str]] = ...,
-        version: Optional[int] = ...,
-    ) -> Any: ...
-    def set(
-        self,
-        key: str,
-        value: Any,
-        timeout: Any = ...,
-        version: Optional[int] = ...,
-    ) -> None: ...
+    def get(self, key: str, default: Optional[Union[int, str]] = ..., version: Optional[int] = ...) -> Any: ...
+    def set(self, key: str, value: Any, timeout: Any = ..., version: Optional[int] = ...) -> None: ...
     def add(
-        self,
-        key: str,
-        value: Union[Dict[str, int], bytes, int, str],
-        timeout: Any = ...,
-        version: Optional[int] = ...,
-    ) -> bool: ...
-    def touch(
-        self, key: str, timeout: Any = ..., version: None = ...
+        self, key: str, value: Union[Dict[str, int], bytes, int, str], timeout: Any = ..., version: Optional[int] = ...
     ) -> bool: ...
+    def touch(self, key: str, timeout: Any = ..., version: None = ...) -> bool: ...
     def delete(self, key: str, version: Optional[int] = ...) -> None: ...
     def has_key(self, key: str, version: Optional[int] = ...) -> Any: ...
     def clear(self) -> None: ...