fix(package.json): update dependencies

[lvgg3271]

There will be an error when the number of connections reaches a certain number.

&yet -- signal master is running at: http://localhost:8888
/opt/signalmaster/node_modules/ws/lib/Receiver.js:386
    default: srcBuffer.copy(dstBuffer, dstOffset, 0, length); break;
                       ^

RangeError: out of range index
    at RangeError (native)
    at fastCopy (/opt/signalmaster/node_modules/ws/lib/Receiver.js:386:24)
    at Receiver.add (/opt/signalmaster/node_modules/ws/lib/Receiver.js:86:3)
    at Socket.realHandler (/opt/signalmaster/node_modules/ws/lib/WebSocket.js:800:20)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    at TCP.onread (net.js:548:20)