Ability to set `useESModules` to `false`

Created by: ivosabev

It seems to me that there is no way in which this settings can be set to false? It could not be overwritten in a babel.config.js neither 😞

https://github.com/facebook/create-react-app/blob/f89385f7438f39750b762590ebd9729534e30190/packages/babel-preset-react-app/create.js#L143