machine:
  node:
    version: v4.2.2

deployment:
  production:
    branch: master
    commands:
      - npm run deploy

machine:
  node:
    version: v6.3.0

deployment:
  production:
    branch: master
    commands:
      - npm run deploy

Update CircleCI environment to Node v6.3.0.
Update CircleCI environment to Node v6.3.0.
