• [fix] Add proper response when handleUpgrade fails (#458)
• [test] Use explicit versions for travis tests (#457)
• [refactor] Remove deprecated code used for nodejs v0.8 (#456)
• [chore] Bump engine.io-parser to version 1.3.2 (#455)
• [perf] websocket optimisation (#453)
• [docs] Rename ServerRequest to IncomingMessage (#448)
• [chore] Bump base64id to version 1.0.0 (#451)