message: Run tests on node 6 and 8
diff: language: node_js
  -cache:
  - directories:
  - - "node_modules"
  +node_js:
  + - "6"
  + - "8"
  + - "10"
  install: npm install
  jobs:
  @@ -9,12 +10,12 @@ jobs:
  - stage: linting
  node_js: "10"
  script: npm run lint
  +
  - stage: tests
  script: npm run test
  - node_js:
  - - "6"
  - - "8"
  - - "10"
  + node_js: "6"
  + - node_js: "8"
  +
  - stage: coverage
  script: npm run ci-test
  node_js: "10"
  