message: green_heart: :bug: yarn is preinstall in circle ci 2.0
diff: @@ -6,21 +6,21 @@ jobs:
  - image: circleci/node:8.10.0
  steps:
  - checkout
  - - run:
  - name: install-yarn
  - command: 'sudo npm install -g yarn'
  - restore_cache:
  - key: dependency-cache-{{ checksum "package.json" }}
  - - run:
  - name: install-yarn-wee
  - command: yarn
  + name: Restore Yarn Package Cache
  + keys:
  + - yarn-packages-{{ checksum "yarn.lock" }}
  - run:
  - name: install-flow-typed-wee
  - command: yarn run flow-typed install
  + name: Install Dependencies
  + command: yarn install
  - save_cache:
  - key: dependency-cache-{{ checksum "package.json" }}
  + name: Save Yarn Package Cache
  + key: yarn-packages-{{ checksum "yarn.lock" }}
  paths:
  - - ./node_modules
  + - ~/.cache/yarn
  + - run:
  + name: Install flow-typed
  + command: yarn run flow-typed install
  - run:
  name: test
  command: yarn test
  