fixed throw new Error('no user') while use wechaty.io

src/io.ts

@@ -218,7 +218,7 @@ export class Io {
 
         case 'update':
           log.verbose('Io', 'on(report): %s', ioEvent.payload)
-          const user = this.setting.wechaty.user()
+          const user = this.setting.wechaty.puppet ? this.setting.wechaty.puppet.user : null
           if (user) {
             const loginEvent: IoEvent = {
               name:       'login'