SocketIOClient: remove unnecessary optional
SocketIOClient: remove unnecessary optional

WeBest/socket.io-client-swift,imjerrybao/socket.io-client-swift,imjerrybao/socket.io-client-swift,nuan-nuan/socket.io-client-swift-1,WeBest/socket.io-client-swift,nuan-nuan/socket.io-client-swift-1,visualarts/socket.io-client-swift,webstersx/socket.io-client-swift,Gaantz/Socket.IO-Client-Swift,KevinMartin/socket.io-client-swift,Gaantz/Socket.IO-Client-Swift,othonbraga/Socket.IO-Client-Swift,codingrhythm/socket.io-client-swift,nuan-nuan/Socket.IO-Client-Swift,visualarts/socket.io-client-swift,webstersx/socket.io-client-swift,webstersx/socket.io-client-swift,Gaantz/Socket.IO-Client-Swift,lightsprint09/socket.io-client-swift,codingrhythm/socket.io-client-swift,codingrhythm/socket.io-client-swift,nuan-nuan/Socket.IO-Client-Swift,othonbraga/Socket.IO-Client-Swift,lightsprint09/socket.io-client-swift,KevinMartin/socket.io-client-swift,nuan-nuan/Socket.IO-Client-Swift,KevinMartin/socket.io-client-swift,visualarts/socket.io-client-swift,nuan-nuan/socket.io-client-swift-1,WeBest/socket.io-client-swift,othonbraga/Socket.IO-Client-Swift,othonbraga/Socket.IO-Client-Swift,imjerrybao/socket.io-client-swift