before_install:
  - sudo apt-get update
  - sudo apt-get install graphicsmagick
language: node_js
node_js:
  - 4.1.2
  - 4.8.4
  - 5.12.0
  - 6.0.0
  - 6.8.1
  - 6.10.0
  - 7.10.0
  - 8.0.0
  - 8.5.0