0.15.0:
* Drop support for Python 2. Please pin to ~= 0.14.0 if you support
Python 2.
* Drop support for Python 3.5, meaning the minimum supported version
is Python 3.6.1.
* Switch events to be dataclass based, otherwise the API is
consistent.
* Add type hints throughout and support PEP 561 via a py.typed
file. This should allow projects that use wsproto to type check their
usage of wsproto.
* Bugfix prevent the test folder being installed as a package called
test.
* Explicitly require Host header in handshake.
* Drop wsaccel support and utilise the aiohttp/@willmcgugan masking
method. wsaccel is unmaintained and this new maksing method is
almost as quick.
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