Readme error about worker start

[Aethelflaed]

The readme states:

This will process jobs in all queues but you can also restrict processing to specific queues:

Backburner.work('newsletter-sender,push-notifier')

But you actually have to pass several parameters or an array for this to work, e.g. :

Backburner.word('newsletter-sender', 'push-notifier')
# Or
Backburner.word(%w(newsletter-sender push-notifier))

[nesquena]

0004ae86a784dec1a8901dcf1568e961393b7b8c Thanks