remove deprecated -e flag to `docker login`

.circleci/deploy.sh

@@ -48,7 +48,7 @@ echo "Configuring gcloud authentication"
 echo "${GCLOUD_SERVICE_KEY}" | base64 --decode > "${HOME}/gcloud-service-key.json"
 ${HOME}/google-cloud-sdk/bin/gcloud auth activate-service-account --key-file "${HOME}/gcloud-service-key.json"
 ${HOME}/google-cloud-sdk/bin/gcloud config set project "${PROJECT_NAME}"
-docker login -e 1234@5678.com -u _json_key -p "$(cat ${HOME}/gcloud-service-key.json)" https://gcr.io
+docker login -u _json_key -p "$(cat ${HOME}/gcloud-service-key.json)" https://gcr.io
 
 echo "Building the tiller image"
 make docker-build VERSION="${VERSION}"