language: node_js
node_js:
  - '4.7.2'
  - '6.9.4'
  - '7.4.0'
script:
  - npm run lint

language: node_js
node_js:
  - '4.8.3'
  - '6.10.3'
  - '7.10.0'
script:
  - npm run lint

Update Node version in Travis config
Update Node version in Travis config
