language: node_js
node_js:
  - "4"
  - "5"
  - "6"
  - "7"
  - "8"
script:
  - npm run ci

language: node_js
node_js:
  - "6"
  - "7"
  - "8"
  - "9"
  - "10"
script:
  - npm run ci

Drop node 4 support, add node 10 support.
Drop node 4 support, add node 10 support.
