OverlayScrollbars integration

[elringus]

I've integrated react-select with OverlayScrollbars.

Hopefully it'll save someone a couple of hours: https://codesandbox.io/s/overlayscrollbars-react-select-dsq9q4?file=/index.js

I've initially attempted routing scroll viewport to the select component (which works with another scroller), but it doesn't seem to work with OverlayScrollbars . If anyone happen to find a more elegant solution, please share.

UPD: Author of the package made an improved version w/o the hacky scrolling stuff: https://codesandbox.io/s/overlayscrollbars-react-select-forked-mjdmt2?file=/index.jsx props to @KingSora :)