language: node_js
sudo: false
script: npm run coverage
node_js:
- '4'
cache:
  directories:
  - node_modules

language: node_js
sudo: false
script: npm run coverage
node_js:
- '6'
- '7'
- '8'
cache:
  directories:
  - node_modules

Update Travis to Node.js 6, 7, and 8
Update Travis to Node.js 6, 7, and 8