sudo: false
language: node_js
node_js:
  - "6"
  - "8"
cache:
  directories:
    - node_modules

sudo: false
language: node_js
node_js:
  - "6"
  - "8"
  - "9"
cache:
  directories:
    - node_modules

Add testing on Node 9
Add testing on Node 9