Add object.__new__ so it can be called.

builtins/2.7/__builtin__.pyi

@@ -28,6 +28,7 @@ class object:
     __class__ = ...  # type: type
 
     def __init__(self) -> None: ...
+    def __new__(cls) -> Any: ...
     def __eq__(self, o: object) -> bool: ...
     def __ne__(self, o: object) -> bool: ...
     def __str__(self) -> str: ...