language: node_js
node_js:
  - 'node'
  - '6'
sudo: false
after_success:
  - "cat coverage/lcov.info | ./node_modules/.bin/coveralls"

language: node_js
node_js:
  - 'stable'
  - '9'
  - '8'
  - '6'
sudo: false
after_success:
  - "cat coverage/lcov.info | ./node_modules/.bin/coveralls"

Extend range of Travis Node.js versions
Extend range of Travis Node.js versions