language: node_js
node_js:
   - "0.10"
   - "0.12"
   - "4"
   - "5"
   - "6"
   - "7"
   - "8.4.0"
   - "9"
   - "10"
script: "make travis"

language: node_js
node_js:
  - '6'
  - '7'
  - '8.4.0'
  - '9'
  - '10'
script: 'make travis'

Drop node.js < 6 support
Travis: Drop node.js < 6 support
