Update README.md (#2015)
Update README.md (#2015)

Fixed some outdated method's names
vam-google/google-cloud-java,mbrukman/gcloud-java,FirebasePrivate/google-cloud-java,vam-google/google-cloud-java,mbrukman/gcloud-java,rborer/google-cloud-java,rborer/google-cloud-java,shinfan/gcloud-java,shinfan/gcloud-java,vam-google/google-cloud-java,shinfan/gcloud-java,shinfan/gcloud-java,FirebasePrivate/google-cloud-java,FirebasePrivate/google-cloud-java,vam-google/google-cloud-java,mbrukman/gcloud-java,FirebasePrivate/google-cloud-java,mbrukman/gcloud-java,rborer/google-cloud-java,shinfan/gcloud-java,rborer/google-cloud-java,rborer/google-cloud-java,FirebasePrivate/google-cloud-java,vam-google/google-cloud-java,vam-google/google-cloud-java