language: node_js
node_js:
  - "4"
  - "5"
  - "6"
  - "7"
  - "8"
before_script:
  - npm install -g grunt-cli

language: node_js
node_js:
  - "4"
  - "5"
  - "6"
  - "7"
  - "8"
  - "10"
  - "stable"
before_script:
  - npm install -g grunt-cli

Test against more node versions
Test against more node versions

Also, lock our node 4 to a known working version
