language: node_js
node_js:
  - "7"
  - "6"
install:
  - yarn
script:
  - yarn run ci

language: node_js
node_js:
  - "8"
  - "7"
  - "6"
install:
  - yarn
script:
  - yarn run ci

Add node 8 to CI config.
Add node 8 to CI config.
