message: add some comments to the Travis config
diff: @@ -9,8 +9,11 @@ cache:
  script:
  - npm run lint
  + # see <https://github.com/facebook/jest/issues/3855> for more info
  - npm test -- --maxWorkers=4
  + # make sure we can build the JS bundles for npm distribution
  - npm run dist
  + # make sure we can build the site
  - npm run build
  notifications:
  