Trio-websockets

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* Improved compliance of close codes.

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* Added support for limiting message size.

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* Added ``host``, ``port`` and ``secure`` attributes on protocols.

* Added support for providing and checking Origin_.

.. _Origin: https://tools.ietf.org/html/rfc6455section-10.2

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.. warning::

**Version 2.0 introduces a backwards-incompatible change in the**
:meth:`~protocol.WebSocketCommonProtocol.send`,
:meth:`~protocol.WebSocketCommonProtocol.ping`, and
:meth:`~protocol.WebSocketCommonProtocol.pong` **APIs.**

**If you're upgrading from 1.x or earlier, please read this carefully.**

These APIs used to be functions. Now they're coroutines.

Instead of::

websocket.send(message)

you must now write::

await websocket.send(message)

Also:

* Added flow control for outgoing data.

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* Initial public release.