language: node_js
node_js:
  - "9"
  - "8"
  - "7"
  - "6"
  - "5"
  - "4"

# Allow Travis tests to run in containers.
sudo: false

# Update package-lock.json after test runs:
before_install:
  - npm install -g npm
  - npm install -g greenkeeper-lockfile@1
before_script: greenkeeper-lockfile-update
after_script: greenkeeper-lockfile-upload