language: node_js
node_js:
  - "7"
  - "6"
  - "5"
  - "4"
cache:
  directories:
    - node_modules
branches:
  only:
    - master

language: node_js
node_js:
  - "9"
  - "8"
  - "7"
  - "6"
  - "5"
  - "4"
cache:
  directories:
    - node_modules
branches:
  only:
    - master

Test on Node.js 8 and 9
Test on Node.js 8 and 9
