run black over stubs, add checking to travis

django-stubs-generated/http/multipartparser.pyi

@@ -5,7 +5,6 @@ from django.core.handlers.wsgi import WSGIRequest
 from django.http.request import QueryDict
 from django.utils.datastructures import ImmutableList, MultiValueDict
 
-
 class MultiPartParserError(Exception): ...
 class InputStreamExhausted(Exception): ...
 
@@ -18,17 +17,13 @@ class MultiPartParser:
         encoding: Optional[str] = ...,
     ) -> None: ...
     def parse(self) -> Tuple[QueryDict, MultiValueDict]: ...
-    def handle_file_complete(
-        self, old_field_name: str, counters: List[int]
-    ) -> None: ...
+    def handle_file_complete(self, old_field_name: str, counters: List[int]) -> None: ...
     def IE_sanitize(self, filename: str) -> str: ...
 
 class LazyStream:
     length: None = ...
     position: int = ...
-    def __init__(
-        self, producer: Union[BoundaryIter, ChunkIter], length: None = ...
-    ) -> None: ...
+    def __init__(self, producer: Union[BoundaryIter, ChunkIter], length: None = ...) -> None: ...
     def tell(self): ...
     def read(self, size: Optional[int] = ...) -> bytes: ...
     def __next__(self) -> bytes: ...
@@ -39,9 +34,7 @@ class LazyStream:
 class ChunkIter:
     flo: Union[_io.BytesIO, django.core.handlers.wsgi.WSGIRequest] = ...
     chunk_size: int = ...
-    def __init__(
-        self, flo: Union[BytesIO, WSGIRequest], chunk_size: int = ...
-    ) -> None: ...
+    def __init__(self, flo: Union[BytesIO, WSGIRequest], chunk_size: int = ...) -> None: ...
     def __next__(self) -> bytes: ...
     def __iter__(self): ...
 
@@ -57,10 +50,4 @@ class BoundaryIter:
 
 class Parser:
     def __init__(self, stream: LazyStream, boundary: bytes) -> None: ...
-    def __iter__(
-        self
-    ) -> Iterator[
-        Tuple[
-            str, Dict[str, Tuple[str, Dict[str, Union[bytes, str]]]], LazyStream
-        ]
-    ]: ...
+    def __iter__(self) -> Iterator[Tuple[str, Dict[str, Tuple[str, Dict[str, Union[bytes, str]]]], LazyStream]]: ...