message: add yarn istall
diff: cache:
  directories:
  - node_modules
  + - ~/.npm
  + - ~/.cache
  yarn: true
  language: node_js
  node_js:
  @@ -15,6 +17,7 @@ matrix:
  env: STAGE=build:mainnet
  before_script:
  - git submodule update --init --recursive
  + - yarn install
  - if [[ "$STAGE" == "test" ]]; then yarn start &; fi
  script:
  - if [[ "$STAGE" == "test" ]]; then $(npm bin)/cypress run --record; fi
  