Update the Dockerfile to use npm to get semver (#73)
Update the Dockerfile to use npm to get semver (#73)

PR-URL: https://github.com/GoogleCloudPlatform/nodejs-docker/pull/73
GoogleCloudPlatform/nodejs-docker,dlorenc/nodejs-docker,dlorenc/nodejs-docker,GoogleCloudPlatform/nodejs-docker,dlorenc/nodejs-docker,GoogleCloudPlatform/nodejs-docker