Regenerate gemspec for version 0.6.4
Regenerate gemspec for version 0.6.4

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