Python-socketio-v4

- Address potential websocket cross-origin attacks [128](https://github.com/miguelgrinberg/python-engineio/issues/128) ([commit](https://github.com/miguelgrinberg/python-engineio/commit/7548f704a0a3000b7ac8a6c88796c4ae58aa9c37))
- Documentation for the Same Origin security policy ([commit](https://github.com/miguelgrinberg/python-socketio/commit/045188c63dffeec82539354fd0498fca969e444e))

- Added rediss:// URL scheme to AsyncRedisManager [319](https://github.com/miguelgrinberg/python-socketio/issues/319) * Added rediss:// URL scheme to AsyncRedisManager * Obeyed flake8 ([commit](https://github.com/miguelgrinberg/python-socketio/commit/0b25ff42b8927ac881be7c8ebe1785819bc4c35e)) (thanks **Dylan Anthony**!)

- Handle keyboard interrupt during reconnect [301](https://github.com/miguelgrinberg/python-socketio/issues/301) ([commit](https://github.com/miguelgrinberg/python-socketio/commit/fa53e3869ce27af3d497d6e021aa2e3d5c808ece))
- Added "to" parameter as an alias to "room" ([commit](https://github.com/miguelgrinberg/python-socketio/commit/8a4e5ffa5ceb03b63156b9520e79a4c7414ac214))
- Correctly autodetect asgi async mode ([commit](https://github.com/miguelgrinberg/python-socketio/commit/eecd3676c15bb7c4c0e165eb02c814cba53a6bb4))
- Improved documentation on user session behavior on disconnections [308](https://github.com/miguelgrinberg/python-socketio/issues/308) ([commit](https://github.com/miguelgrinberg/python-socketio/commit/2aa8636223d714b1c87323f625645a433ac7e010))

- New event decorator for handler registration ([commit](https://github.com/miguelgrinberg/python-socketio/commit/70ebfdbfa1ad40e471b93dc9b0d3a9c2e7025ce0))
- Much more flexible support for static files in the server ([commit](https://github.com/miguelgrinberg/python-socketio/commit/aaa87a82779c5dbd5f2cac19991a6ca93bde90ae))
- Move python-engineio dependency to versions 3.8 and up ([commit](https://github.com/miguelgrinberg/python-socketio/commit/814ff84ec310ce208522c8fd00302fdc1a689f44))
- Various simplifications to examples ([commit](https://github.com/miguelgrinberg/python-socketio/commit/0f42c181da7c56ca270814442bdebeecb0e38bf6))
- Expose the sid for the connection as `sio.sid` ([commit](https://github.com/miguelgrinberg/python-socketio/commit/3b32dbde8d59d0df7c958534732f5d5437f8decf))

- skip_sid parameter can also be a list [202](https://github.com/miguelgrinberg/python-socketio/issues/202) ([commit](https://github.com/miguelgrinberg/python-socketio/commit/00d39ca6985e94e283f5c766c18cacb760e0658d))
- Fixed Sanic documentation [193](https://github.com/miguelgrinberg/python-socketio/issues/193) ([commit](https://github.com/miguelgrinberg/python-socketio/commit/0249f05a2fb94c29f3be5cb33248b30d6c748eba))
- Added note on CORS support for sanic [205](https://github.com/miguelgrinberg/python-socketio/issues/205) ([commit](https://github.com/miguelgrinberg/python-socketio/commit/d3e19b7e52debe0db759f56e25eb2706ad2434b6))
- flake8 fixes ([commit](https://github.com/miguelgrinberg/python-socketio/commit/18fa5286c7505813aca2a8c99606bdcce7cadf31))
- added python 3.7 build ([commit](https://github.com/miguelgrinberg/python-socketio/commit/7348d923e3af0331706c51053120e672fa0dabc1))
- added change log ([commit](https://github.com/miguelgrinberg/python-socketio/commit/7803a7bce0fca52f8b40668e97395018be339c16))
- auto-generate change log during release ([commit](https://github.com/miguelgrinberg/python-socketio/commit/b46dc0fa1a1435dcbd43d21b2c6d0bc33a4da6ea))

- properly handle disconnects from ios client ([commit](https://github.com/miguelgrinberg/python-socketio/commit/c0c1bf8d21e3597389b18938550a0724dd9676b7))
- updated asgi examples to the latest uvicorn ([commit](https://github.com/miguelgrinberg/python-socketio/commit/f86999ff9c3ac5202b017afb9b50036f1f7903a2))
- helper release script ([commit](https://github.com/miguelgrinberg/python-socketio/commit/4632a3522e7e855ca006f797411f02e56291e07d))
- fixed requirements file ([commit](https://github.com/miguelgrinberg/python-socketio/commit/dd3608c79e751940491a2841f8a1b1d63de841dc))
- updated some requirements ([commit](https://github.com/miguelgrinberg/python-socketio/commit/ac7fa5cb5efc750b7d8199fb16557d332f4229d3))