refactor(lib): modify syntax via eslint

Author: hiroppy

lib/Server.js

@@ -31,7 +31,7 @@ const optionsSchema = require('./optionsSchema.json');
   // eslint-disable-next-line global-require
   const SockjsSession = require('sockjs/lib/transport').Session;
   const decorateConnection = SockjsSession.prototype.decorateConnection;
-  SockjsSession.prototype.decorateConnection = function(req) {
+  SockjsSession.prototype.decorateConnection = function (req) {
     decorateConnection.call(this, req);
     const connection = this.connection;
     if (connection.headers && !('origin' in connection.headers) && 'origin' in req.headers) {