language: node_js
node_js:
  - 'stable'
  - '8'
  - '7'
  - '6'
  - '5'
  - '4'
before_install:
  - npm i -g npm@5
  - npm i -g greenkeeper-lockfile@1
before_script: greenkeeper-lockfile-update
after_script: greenkeeper-lockfile-upload

language: node_js
node_js:
  - 'stable'
  - '8'
  - '7'
  - '6'
before_install:
  - npm i -g greenkeeper-lockfile@1
before_script: greenkeeper-lockfile-update
after_script: greenkeeper-lockfile-upload

Remove explicit npm@5 install and old versions of Node.
Remove explicit npm@5 install and old versions of Node.