Varnish 5 has been released a few weeks ago, and the good news for configuration maintainers like me is: backwards compatible configs!
So updating the repository with support for Varnish 5.x was relatively easy, you can find updated configurations here: github.com/mattiasgeniar/varnish-5.0-configuration-templates.
Many of the boilerplate configurations are just exactly the same as the 4.x configurations. However, creating a new repository for this allows me to include 5.x-only features like PROXY, HTTP/2 etc.
If you just want to start with Varnish 5, have a look at that repo. It doesn't do many varnish-5-only features yet, but I plan to add that very soon!