language: node_js
node_js:
  - 4
  - node
after_success:
  - if [[ $(node --version) == v4* ]]; then npm run test:coveralls; fi

language: node_js
node_js:
  - 4
  - 5
  - 6
after_success:
  - if [[ $(node --version) == v6* ]]; then npm run test:coveralls; fi

Update Travis config to upload coverage from Node v6
Update Travis config to upload coverage from Node v6

Enables all features to be tested, without fallbacks for old versions
