language: node_js
node_js:
  - "4"
  - "6"
  - "8"
  - "9"
script: "npm run-script travis"

language: node_js
node_js:
  - '4'
  - '6'
  - '8'
  - '10'
script: 'npm run-script travis'

Test with node.js 10 instead of 9
Travis: Test with node.js 10 instead of 9
