[chore] Update default values for pingInterval and pingTimeout

`pingInterval` now defaults to 15 seconds, and `pingTimeout` to 5 seconds.

Author: darrachequesne

lib/server.js

@@ -37,8 +37,8 @@ function Server (opts) {
   opts = opts || {};
 
   this.wsEngine = opts.wsEngine || process.env.EIO_WS_ENGINE || 'uws';
-  this.pingTimeout = opts.pingTimeout || 60000;
-  this.pingInterval = opts.pingInterval || 25000;
+  this.pingTimeout = opts.pingTimeout || 5000;
+  this.pingInterval = opts.pingInterval || 15000;
   this.upgradeTimeout = opts.upgradeTimeout || 10000;
   this.maxHttpBufferSize = opts.maxHttpBufferSize || 10E7;
   this.transports = opts.transports || Object.keys(transports);