以前的视频没讲用redis存储队列，能否讲一下？
如果更完整一点就更好了：
用redis队列存储和发送注册激活邮件(邮件服务使用sendcloud)。laravel干点啥经常都层层转包，多转包几次就不知道到哪里去了。
https://laravel.com/docs/5.3/queues#introduction
Other Driver Prerequisites
The following dependencies are needed for the listed queue drivers:
Amazon SQS: aws/aws-sdk-php ~3.0
Beanstalkd: pda/pheanstalk ~3.0
Redis: predis/predis ~1.0
