language: node_js
cache:
  directories:
  - node_modules
node_js:
  - "4"
  - "6"
  - "8"
after_success: 'npm run coveralls'

language: node_js
cache:
  directories:
  - node_modules
node_js:
  - "6"
  - "8"
  - "9"
after_success: 'npm run coveralls'

Remove Node 4 and 7, add 8 and 9
ci(matrix): Remove Node 4 and 7, add 8 and 9
