message: WebAdapter: Add isConnected method
diff: @@ -305,4 +305,14 @@ export class WebAdapter extends BotAdapter {
  res.end();
  }
  }
  +
  + /**
  + * Is given user currently connected?
  + *
  + * Example: `bot.controller.adapter.isConnected(message.user)`
  + * @param user
  + */
  + public isConnected(user: string): boolean {
  + return typeof clients[user] !== 'undefined';
  + }
  }
  