changing README to use puma instead of shotgun
changing README to use puma instead of shotgun

rvml/deployinator,rvml/deployinator,nkammah/deployinator,nkammah/deployinator,friedenberg/deployinator,friedenberg/deployinator,nkammah/deployinator,etsy/deployinator,rvml/deployinator,etsy/deployinator,friedenberg/deployinator,etsy/deployinator