language: node_js
node_js:
  - "7"
install:
  - yarn install -g elm
  - yarn install -y
  - elm-package install -y

language: node_js
node_js:
  - "7"
install:
  - npm install -g elm
  - npm install -y
  - elm-package install -y

Switch back to NPM until TravisCI build includes Yarn pre-installed.
Switch back to NPM until TravisCI build includes Yarn pre-installed.

- https://github.com/travis-ci/travis-ci/issues/6720#issuecomment-254988120
