Fix typo in README
Fix typo in README
ggeorgiev/docker-image-resource,ggeorgiev/docker-image-resource,barthy1/docker-image-resource,SillyMoo/docker-image-resource,concourse/docker-image-resource,barthy1/docker-image-resource,SillyMoo/docker-image-resource,Pivotal-DataFabric/docker-image-resource,concourse/docker-image-resource