https://reactjs.org/blog/2018/10/01/create-react-app-v2.html

AT:

• create react app dependency is updated to the latest version
• IE11 support still works
• if the required node.js version changed, it is updated in all documentation that mentions it
• the dev proxy setting still works
• if possible, the development is made easier:
  • testing supports shallow rendering without mocking
  • components that need to be mocked (e.g. bpmn-js viewer) are mocked at a central place