language: node_js
node_js:
  - "6"
cache:
  directories:
    - node_modules
scripts:
  - npm test
branches:
  only:
  - master
  - /^greenkeeper/.*$/

language: node_js
node_js:
  - "12"
cache:
  directories:
    - node_modules
scripts:
  - npm test
branches:
  only:
  - master
  - /^greenkeeper/.*$/

Configure CI to run on Node 12
Configure CI to run on Node 12

Several development tools have dropped support for older versions.
