message: upgrade yarn, since travis wont
diff: @@ -11,6 +11,8 @@ node_js:
  services:
  - docker
  before_install:
  + - curl -o- -L https://yarnpkg.com/install.sh | bash
  + - export PATH="$HOME/.yarn/bin:$PATH"
  - pyenv install -s 3.6
  - pyenv shell 3.6
  - pip3 install peru
  