As of today, you can now embed your sponsors on read.cash into your other sites and GitHub.
Though, GitHub presents a bit of a problem, since it doesn't allow any interactivity and also seems to cache the image (hopefully, not forever, but we don't know).
If you control your own site - you can easily embed an interactive version with clickable logos, like this.
Here's an example embed on GitHub (it links to the interactive SVG version), you'll notice also the link to the new "Become a sponsor" page, which is much more friendly towards users who don't yet have an account. Previously, you'd be redirected to the homepage, instead of continuing your workflow).
So, head on to http://read.cash/sponsors and start testing! Let us know of all the bugs you find and all the ideas for improvement that you have.