This seems a little disingenuous, since anyone using net/http will get http2 support for free since 1.6 it has been steadily improving. I've changed the link to point to the project home page. I do think the author should spend more time quietly plugging away on improving this project and less time on promotion - github stars are a little like page visits, popularity is necessary perhaps for a project to flourish but is not a good long-term goal - being used for production sites and being steadily developed in line with real-world requirements (not benchmarks or feature lists) is far more important. The best frameworks I've used were extracted from real projects rather than made from scratch.
As @tomf says below, I'm not sure if this is used for anything in production yet? Would love to see some links to the projects if so.