language: node_js
node_js:
  - "4"
  - "5"
script:
  - npm test

language: node_js
node_js:
  - stable
  - lts/*
  - 6.9
script:
  - npm test

Drop support for node version older than 6
Drop support for node version older than 6

Versions older than node 6 are no longer supported by html-webpack-plugin version 4. See: https://github.com/jantimon/html-webpack-plugin/pull/861