Log Message:
3.4:
Renamed :func:`~websockets.server.serve()` and \ 
:func:`~websockets.client.connect()`'s klass argument to create_protocol to \ 
reflect that it can also be a callable. For backwards compatibility, klass is \ 
still supported.
:func:`~websockets.server.serve` can be used as an asynchronous context manager \ 
on Python ≥ 3.5.
Added support for customizing handling of incoming connections with \ 
:meth:`~websockets.server.WebSocketServerProtocol.process_request()`.
Made read and write buffer sizes configurable.
Rewrote HTTP handling for simplicity and performance.
Added an optional C extension to speed up low level operations.
An invalid response status code during :func:`~websockets.client.connect` now \ 
raises :class:`~websockets.exceptions.InvalidStatusCode` with a code attribute.