language: node_js
node_js:
  - "4"
before_script:
  - make build
script:
  - hack/test-headless.sh test
  - hack/verify-dist.sh
addons:
  firefox: "49.0"

language: node_js
node_js:
  - "6"
before_script:
  - make build
script:
  - hack/test-headless.sh test
  - hack/verify-dist.sh
addons:
  firefox: "49.0"

Use Node.js 6 for Travis
Use Node.js 6 for Travis
