How to install ionic-platform-web-client 0.8.0?

I want to test the ionic-platform-web-client 0.8.0 which already supports Ionic 2.

How do I install it in a Ionic 2 project? The ionic add ionic-platform-web-client command still doesn’t support v2 apps. Any workaround?

So that link is to a unpublished branch of the web-client.
At the moment, it is still unreleased code.