Update README - GCS Signature (#1807)
Update README - GCS Signature (#1807)

Update the readme to match the current GCS
IIFE invocation signature. Without updated
signature invoking on property bucket will
cause an exception to be thrown.
googleapis/google-cloud-node,googleapis/google-cloud-node,jcking/google-cloud-node,GoogleCloudPlatform/gcloud-node,jcking/google-cloud-node,googleapis/google-cloud-node,jgeewax/gcloud-node,GoogleCloudPlatform/gcloud-node,callmehiphop/gcloud-node,ofrobots/google-cloud-node,googleapis/google-cloud-node,jcking/google-cloud-node,GoogleCloudPlatform/gcloud-node,jgeewax/gcloud-node,ofrobots/google-cloud-node,callmehiphop/gcloud-node,ofrobots/google-cloud-node