Add example for method mentioned
Add example for method mentioned

I found myself needing this method, finding it, but not finding a reference to
the order of arguments. Found it in the source and added it here in the README.

guizmaii/resque-scheduler,carsonreinke/resque-scheduler,xldenis/resque-scheduler,playtestcloud/resque-scheduler,resque/resque-scheduler,carsonreinke/resque-scheduler,playtestcloud/resque-scheduler,playtestcloud/resque-scheduler,xldenis/resque-scheduler,xldenis/resque-scheduler,resque/resque-scheduler,guizmaii/resque-scheduler,carsonreinke/resque-scheduler,resque/resque-scheduler,guizmaii/resque-scheduler