message: Use workspaces per OS and Node.js version
  (to prevent slow Win build overwriting global workspace
  with an empty folder)
diff: @@ -23,7 +23,7 @@ cache:
  - frontend/node_modules
  workspaces:
  create:
  - name: lcov
  + name: "$TRAVIS_OS_NAME_$TRAVIS_NODE_VERSION_lcov"
  paths:
  - build/reports/coverage/frontend-tests/lcov.info
  - build/reports/coverage/server-tests/lcov.info
  @@ -68,7 +68,7 @@ jobs:
  os: linux
  workspaces:
  use:
  - - lcov
  + - "$TRAVIS_OS_NAME_$TRAVIS_NODE_VERSION_lcov"
  before_script:
  - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64
  > ./cc-test-reporter
  