message: Drop node v4 support
diff: @@ -2,9 +2,9 @@ dist: trusty
  sudo: required
  language: node_js
  node_js:
  + - "9"
  - "8"
  - "6"
  - - "4"
  before_install:
  - sudo sysctl fs.inotify.max_user_watches=524288
  - yarn global add greenkeeper-lockfile@1 rimraf
  