Remove redundant link from README.md
Remove redundant link from README.md

Remove link from "Cloud Vision" to non-existent link
GoogleCloudPlatform/gcloud-node,GoogleCloudPlatform/gcloud-node,ofrobots/google-cloud-node,ofrobots/google-cloud-node,callmehiphop/gcloud-node,googleapis/google-cloud-node,jgeewax/gcloud-node,googleapis/google-cloud-node,googleapis/google-cloud-node,ofrobots/google-cloud-node,googleapis/google-cloud-node,jgeewax/gcloud-node,callmehiphop/gcloud-node,GoogleCloudPlatform/gcloud-node