message: Mention that .babelrc might by cached
diff: @@ -227,6 +227,8 @@ ES modules to CommonJS modules only in the `test` environment.
  }
  ```
  +> Note: Jest caches files to speed up test execution. If you updated .babelrc and Jest is still not working, try running Jest with `--no-cache`.
  +
  If you use dynamic imports (`import('some-file.js').then(module => ...)`), you
  need to enable the `dynamic-import-node` plugin.
  