Support ref forwarding

[CharlieHess]

This lets users hook a ref to the inner div for maximum flexibility. Totally backwards compatible change, too!

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🔍 Inspect: https://vercel.com/vasin/react-div-100vh/ENDKcbeZu5YxUHHYjPE3zCbC67zp
✅ Preview: https://react-div-100vh-git-fork-charliehess-patch-1-vasin.vercel.app

[mvasin]

Hey @CharlieHess, thanks for the PR!

Seems like formatting check failed (please amend the commit with yarn prettier:write) and there's something with DCO.

Also, a test would be great - but nevermind, I can add it myself.

[CharlieHess]

hi @mvasin, sorry for the delay. to get this passing I had to disable some react lint rules. I'm not sure why you'd need to validate prop-types in a TypeScript component, and the display-name wasn't set before, either. so I think the current master would not pass these lint rules either.

[mvasin]

Thanks for the PR, @CharlieHess! I added a test and the display name.