Log Message:
py-h11: updated to 0.9.0

v0.9.0:

Bug fixes:
* Allow a broader range of characters in header values. This violates
  the RFC, but is apparently required for compatibility with
  real-world code, like Google Analytics cookies
* Validate incoming and outgoing request paths for invalid
  characters. This prevents a variety of potential security issues
  that have affected other HTTP clients.
* Force status codes to be integers, thereby allowing stdlib
  HTTPStatus IntEnums to be used when constructing responses

Other changes:
* Make all sentinel values inspectable by IDEs, and split
  SEND_BODY_DONE into SEND_BODY, and DONE
* Drop support for Python 3.3.
* LocalProtocolError raised in start_next_cycle now shows states for
  more informative errors