fix watchdog & readyState sequence bug

src/puppet-web/index.js

@@ -97,14 +97,14 @@ class PuppetWeb extends Puppet {
       throw new Error('do not call quit again when quiting')
     }
 
-    this.readyState('disconnecting')
-
-    // this.clearWatchDogTimer()
+    // POISON must feed before readyState set to "disconnecting"
     this.emit('watchdog', {
       data: 'PuppetWeb.quit()',
       type: 'POISON'
     })
 
+    this.readyState('disconnecting')
+
     return co.call(this, function* () {
 
       if (this.bridge)  {