package: bump `engine.io-client` for node4 compatibility
package: bump `engine.io-client` for node4 compatibility

socketio/socket.io-client,philikon/socket.io-client,fhaoquan/socket.io-client,Alexandre-io/socket.io-client,iFixit/socket.io-client,watnotte/socket.io-client,nkzawa/socket.io-client,paramburu/socket.io-client,ayhansalami/socket.io-client,socketio/socket.io-client,socketio/socket.io-client,nus-fboa2016-si/socket.io-client,goodwall/socket.io-client,hellpf/socket.io-client,mcanthony/socket.io-client,kambisports/socket.io-client,Nibbler999/socket.io-client,YonasBerhe/socket.io-client,Automattic/socket.io-client