fix bug in release process (#2844)
fix bug in release process (#2844)


quartzmo/google-cloud-ruby,dazuma/google-cloud-ruby,quartzmo/google-cloud-ruby,quartzmo/google-cloud-ruby,dazuma/google-cloud-ruby,quartzmo/google-cloud-ruby,dazuma/google-cloud-ruby,googleapis/google-cloud-ruby,dazuma/google-cloud-ruby,googleapis/google-cloud-ruby,googleapis/google-cloud-ruby,googleapis/google-cloud-ruby,googleapis/google-cloud-ruby,dazuma/google-cloud-ruby,quartzmo/google-cloud-ruby,googleapis/google-cloud-ruby,blowmage/gcloud-ruby,dazuma/google-cloud-ruby,quartzmo/google-cloud-ruby