Simple-websocket

- Added support for IPv6 in the sync client (async already supports it) [39](https://github.com/miguelgrinberg/simple-websocket/issues/39) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/d4f05c7dd5ede0364c1f69e8e854b9b4ef80f1a7))
- Added a top-level exception class ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/e7c225ea1824a23fe2fe6ec2ef7b64dd9b9dc80f))
- Improve handling of immediately closed sockets with ping/pong enabled [35](https://github.com/miguelgrinberg/simple-websocket/issues/35) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/632ec52ce1fce4908b9733e3d24935b2a0514472)) (thanks **Łukasz Kędziora**!)
- Unblock `receive()` call on timeout disconnections [33](https://github.com/miguelgrinberg/simple-websocket/issues/33) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/5a5dbecd23e67c09780c21af586ca9e36c6b6417)) (thanks **Łukasz Kędziora**!)

- New async client and server [28](https://github.com/miguelgrinberg/simple-websocket/issues/28) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/57c5ffcb25c14d5c70f1ad4edd0261cdfcd27c94))
- On a closed connection, return buffered input before raising an exception [30](https://github.com/miguelgrinberg/simple-websocket/issues/30) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/6c87abe22215c45b3dc0dadc168c3dd061eb2aa4))
- Do not duplicate SSLSocket instances [26](https://github.com/miguelgrinberg/simple-websocket/issues/26) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/da42e98bf80f22747089946a6a08840e0bf646a9))
- Handle broken pipe errors in background thread [29](https://github.com/miguelgrinberg/simple-websocket/issues/29) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/6f92764754550fc85b25e42182050c1e6636a41d))
- Remove unused argument ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/245eedcf1e82fd3d199a6f7bf44916047588763d))
- Eliminate race conditions during testing [27](https://github.com/miguelgrinberg/simple-websocket/issues/27) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/a37c79dc9ec8a54968d8b849c7f0a2e3bca46db8))
- Remove python 3.7 from unit tests ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/761925a635901b4641ad63b6072c24ff5c4099d5))

- Duplicate the gevent socket to avoid using it in multiple greenlets [24](https://github.com/miguelgrinberg/simple-websocket/issues/24) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/ebc12b1a390ab36d8dcd020b45410da282fa8d60))
- Add Python 3.11 to builds ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/df5c92a8d8b48e3482be5ad7af2628b17e6d6d07))

- Support custom headers in the client ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/4f5c653378e77026604b4b25b8a5373da48b5f74))

- Properly clean up closed connections [19](https://github.com/miguelgrinberg/simple-websocket/issues/19) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/9bda31010405045125b304afd633b9a9a5171335)) (thanks **Carlos Carvalho**!)

- Correct handling of an empty subprotocol list in server [22](https://github.com/miguelgrinberg/simple-websocket/issues/22) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/cf336163fbc65281163fac0c253c4281b760c169))
- Handshake robustness with slow clients such as microcontrollers ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/271f8fc3ee466a0d0bd5a71543b2e50a632891dd))
- Prevent race condition on client close [18](https://github.com/miguelgrinberg/simple-websocket/issues/18) ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/e17449153b472a801df4bf2246f06a8486d91c9d))
- Improved documentation for subprotocol negotiation ([commit](https://github.com/miguelgrinberg/simple-websocket/commit/c74785482ff266c552692a330c3c71d2b9d1f438))