machine:
  node:
    version: "6.3.0"
deployment:
  production:
    branch: master
    commands: yarn run build
    heroku:
      appname: enrtama

machine:
  node:
    version: "6.3.0"
dependencies:
  post:
    - yarn run build
deployment:
  production:
    branch: master
    commands: yarn run build
    heroku:
      appname: enrtama

Add build after npm install
Add build after npm install
