language: node_js
node_js:
  - "6"
  - "6.5"
  - "4"
  - "4.4"
  - "iojs"
script:
  - gulp

language: node_js
node_js:
  - "7"
  - "6"
  - "6.5"
script:
  - gulp

Update compatibility of node.js versions
Update compatibility of node.js versions

* Remove old node.js versions as their versions of npm are not
  compatible with eslint-config-ftgp
  https://github.com/eslint/eslint/issues/3458#issuecomment-132921218

* Add node.js 7
