Release share v0.48.0 (2023-07-07)

This release bring many enhancements to lib/websocket including timeout,
handling upgrade and read/write concurrently using goroutine.

=== Breaking changes

* lib/net: changes the WaitRead/Event model on Poll

=== Bug fixes

* lib/websocket: call Quit when handshake contains close or invalid
  frame
* lib/websocket: revert maxBuffer back to 1024

=== New features

* lib/ascii: add type Set
* lib/net: implement generic PollEvent

=== Enhancements

* lib/websocket: add option to set read/write timeout on Server
* lib/websocket: handle concurrent upgrade using goroutine
* lib/websocket: handle concurrent Server read using goroutines
* lib/websocket: handle concurrent ping using goroutines

=== Chores

* websocket/testdata: rewrite autobahn test using container
-----BEGIN PGP SIGNATURE-----

iHUEABYIAB0WIQSyS35x1RIQ2SkuGz5KU2C1AMnE8AUCZKgGoQAKCRBKU2C1AMnE
8EMUAPsHa4G9prLHK/WU+MXMHbooi6CXm9GViveqdH85c5HiVQD+Po7Tidg1OMYR
wxQZrtnqIfBy1xIx6wFUytVqpZmmxQ4=
=ZRms
-----END PGP SIGNATURE-----