Add bootstrap 4 renderer (+ tests)?

[Langmans]

Bootstrap 4 is in beta so IMHO it's safe to assume they are not going to change classes by a lot (which was the case in the alphas.. blegh).

Maybe I can see about making a bootstrap 4 renderer, if so I will add a pull request.

Migration instructions are here:

https://getbootstrap.com/docs/4.0/migration/#navs (for li / a) https://getbootstrap.com/docs/4.0/migration/#navbar (for the containers and uls)

[anlutro]

Hey, if you want to give it a shot please do! I'd be happy to try and give guidance - though I haven't worked with this library in years now, so I might be figuring out the code just as much as you :)

[Langmans]

Is there anything else that you are using in favor of this?

[anlutro]

No, just haven't worked with PHP for 2-3 years now.