Updating README with --check changes
Updating README with --check changes

Moving staleness checking functionality from being a rake-only
environment variable flag to being supported properly by the
wd command-line script.

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