language: node_js
node_js:
  - 6
  - 7
  - lts/boron
env:
  - CXX=g++-4.8
addons:
  apt:
    sources:
      - ubuntu-toolchain-r-test
    packages:
      - g++-4.8

language: node_js
node_js:
  - 6
  - 7
  - lts/boron
env:
  - CXX=g++-4.8
addons:
  apt:
    sources:
      - ubuntu-toolchain-r-test
    packages:
      - g++-4.8
cache: yarn

Use yarn as default dependency management system
ci: Use yarn as default dependency management system

Use yarn in TravisCI
