Fixing flake8 E401, E402 errors

stdlib/2/io.pyi

@@ -4,10 +4,10 @@
 
 # Only a subset of functionality is included.
 
-DEFAULT_BUFFER_SIZE = 0
-
 from typing import List, BinaryIO, TextIO, IO, overload, Iterator, Iterable, Any, Union
 
+DEFAULT_BUFFER_SIZE = 0
+
 def open(file: Union[str, unicode, int],
          mode: unicode = ..., buffering: int = ..., encoding: unicode = ...,
          errors: unicode = ..., newline: unicode = ...,