language: node_js
node_js:
  - "4"
  - "5"
  - "6"
  - "7"
  - "8"
script: echo "code tests" ; npm run test; echo "readme tests" ; npm run test-readme ; echo "documentation example tests" ; npm run test-docs

language: node_js
node_js:
  - "6"
  - "7"
  - "8"
  - "9"
script: echo "code tests" ; npm run test; echo "readme tests" ; npm run test-readme ; echo "documentation example tests" ; npm run test-docs

Test on Node v9, stop testing on 4 and 5
Travis: Test on Node v9, stop testing on 4 and 5
