Change react-dom to react-dom/client

[benfaerber]

React recommends importing the client for the new create root API. Importing from "react-dom" throws this warning in React 18

Warning: You are importing createRoot from "react-dom" which is not supported. You should instead import it from "react-dom/client

In my project I use this modification and it removes the error.

[cknitt]

Thank you for your contribution! Sorry for the long delay in merging.