Please add reactstrap to the list (user guide list)

Created by: guledali

@TheSharpieOne @eddywashere

I just want to start out with saying I love ❤react and I think create-react-app is the greatest but I love bootstrap too with that said, this library as good as it's https://react-bootstrap.github.io/ it still uses bootstrap 3. I'm not okay with that ... bootstrap 3 is kinda ugly and old at this point and on top of that it's hard to use this library, ah the examples and the code snippets idk I find it hard.

The page itself should look more like this https://getbootstrap.com/ clean and modern

This one https://reactstrap.github.io/ should at least be included in the list for people like me who want to use bootstrap 4