Update www/py-hyperframe to 5.0.0

Changes:
5.0.0 (2017-03-07)
------------------
**Backwards Incompatible API Changes**
- Added support for unknown extension frames. These will be returned in the new
  ``ExtensionFrame`` object. The flag information for these frames is persisted
  in ``flag_byte`` if needed.

4.0.2 (2017-02-20)
------------------
**Bugfixes**
- Fixed AltSvc stream association, which was incorrectly set to ``'both'``:
  should have been ``'either'``.
- Fixed a bug where stream IDs on received frames were allowed to be 32-bit,
  instead of 31-bit.
- Fixed a bug with frames that had the ``PADDING`` flag set but zero-length
  padding, whose flow-controlled length was calculated wrongly.
- Miscellaneous performance improvements to serialization and parsing logic.

4.0.1 (2016-03-13)
------------------
**Bugfixes**
- Fixed bug with the repr of ``AltSvcFrame``, where building it could throw
  exceptions if the frame had been received from the network.

4.0.0 (2016-03-13)
------------------
**Backwards Incompatible API Changes**
- Updated old ALTSVC frame definition to match the newly specified RFC 7838.
- Remove BLOCKED frame, which was never actually specified.
- Removed previously deprecated ``SettingsFrame.SETTINGS_MAX_FRAME_SIZE`` and
  ``SettingsFrame.SETTINGS_MAX_HEADER_LIST_SIZE``.

(leot)