* _break_: $conn->WebSocket->request replaced with $conn->httpRequest which is a PSR-7 object * _feature_: Binary messages now supported via Ratchet\WebSocket\MessageComponentInterface * _feature_: Added heartbeat support via ping/pong in WsServer * _break_: No longer support old (and insecure) Hixie76 and Hybi protocols * _break_: No longer support disabling UTF-8 checks * _break_: The Session component implements HttpServerInterface instead of WsServerInterface * _break_: PHP 5.3 no longer supported * _break_: Update to newer version of react/socket dependency * _break_: WAMP topics reduced to 0 subscriptions are deleted, new subs to same name will result in new Topic instance * _feature_: Significant performance enhancements An additional page has been added to the website for [migrating from 0.3](http://socketo.me/docs/migration-3)