message: travis xenial
  includes yarn 1.13 by default
diff: language: node_js
  node_js: 10
  -install:
  - - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version $YARN_VERSION
  - - export PATH="$HOME/.yarn/bin:$PATH"
  - - yarn install
  +dist: xenial
  script: build/travis_build.sh
  sudo: false
  cache:
  