Fixing wording on customizing stacks in README
Fixing wording on customizing stacks in README

rvml/deployinator,etsy/deployinator,jdycar/deployinator,jdycar/deployinator,mpgarate/deployinator,nkammah/deployinator,rvml/deployinator,cyberrodent/deployinator,etsy/deployinator,mpgarate/deployinator,friedenberg/deployinator,cyberrodent/deployinator,nkammah/deployinator,etsy/deployinator,cyberrodent/deployinator,jdycar/deployinator,friedenberg/deployinator,rvml/deployinator,nkammah/deployinator,friedenberg/deployinator,mpgarate/deployinator