Mention Good Job as Active Job backend.

It's fully based on Rails, so not really possible to run in any other way.
Thanks to that it is simple, yet powerfull.
It's very well maintained and used in production systems by many people.

[ci skip]

Author: morgoth

guides/source/active_job_basics.md

@@ -172,6 +172,7 @@ Here is a noncomprehensive list of documentation:
 - [Queue Classic](https://github.com/QueueClassic/queue_classic#active-job)
 - [Delayed Job](https://github.com/collectiveidea/delayed_job#active-job)
 - [Que](https://github.com/que-rb/que#additional-rails-specific-setup)
+- [Good Job](https://github.com/bensheldon/good_job#readme)
 
 Queues
 ------