updating README to document new roles functionality
updating README to document new roles functionality

pbrumm/whiskey_disk,pbrumm/whiskey_disk,kingandpartners/whiskey_disk,openlogic/whisk,flogic/whiskey_disk,flogic/whiskey_disk,pbrumm/whiskey_disk,openlogic/whisk,openlogic/whisk,flogic/whiskey_disk