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

Remove link from Cloud Vision to non-existent header
shinfan/gcloud-java,rborer/google-cloud-java,shinfan/gcloud-java,FirebasePrivate/google-cloud-java,mbrukman/gcloud-java,FirebasePrivate/google-cloud-java,rborer/google-cloud-java,vam-google/google-cloud-java,rborer/google-cloud-java,mbrukman/gcloud-java,shinfan/gcloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java,FirebasePrivate/google-cloud-java,FirebasePrivate/google-cloud-java,rborer/google-cloud-java,rborer/google-cloud-java,vam-google/google-cloud-java,shinfan/gcloud-java,FirebasePrivate/google-cloud-java,mbrukman/gcloud-java,vam-google/google-cloud-java,shinfan/gcloud-java,mbrukman/gcloud-java,vam-google/google-cloud-java