Added renderMenuContainer prop.

[tgreblicki]

Exposes additional property which accepts function for decorating menuRendered.

As react-virtualized-select uses menuRenderer prop for rendering virtualized dropdown. This property allows easy way to add custom content around dropdown.

[sbauch]

I could really use something like this, any chance of it being merged?

One alternative approach that may warrant consideration is exposing the menuRenderer prop itself, and using the existing function by default.

[bvaughn]

Realistically, I won't have time to review/merge or release an updated version of this library any time soon. I'm swamped with higher priority stuff. I'm sorry.

[sbauch]

Completely understand, thanks for a great lib!

@tgreblicki im going to fork your fork and make a few changes that will allow me to install from github 🎉

[bvaughn]

Thanks for being so understanding 😄

As a possible alternative: if one of you would like to be added to this repo/NPM package, I'd welcome another maintainer