Hello. I have a question about the `react-dev-utils/webpackHotDevClient`. SockJS there (see https://github.com/facebookincubator/create-react-app/blob/next/packages/react-dev-utils/webpackHotDevClient.js#L64) is instantiated with not customized host and port but with the corresponding parameters of the original window. Is it intended and/or are there any strict contraindications against customizing host and port? If yes, what's the explanation? If not, would it make sense if I handle this issue and make a PR? Thank you!