language: node_js
node_js:
  - "8"
  - "7"
  - "6"
  - "5"
  - "4"
cache:
  directories:
    - "node_modules"
before_script:
  - npm run check-security
  - npm run lint-ci
  - npm run clean-build
  - npm run build-ci
language: node_js
node_js:
  - "8"
  - "7"
  - "6"
cache:
  directories:
    - "node_modules"
before_script:
  - npm run check-security
  - npm run lint-ci
  - npm run clean-build
  - npm run build-ci
Remove support for Node.js v4 and v5
Remove support for Node.js v4 and v5

Koa cannot be used with Node v4 and v5 as is. Remove this support for now. May consider re-adding it later.