v20.16.0

HTTP/3 Cinema 🍿 📽️

While still highly experimental, the HTTP/3 support is now functional enough to stream a large video file correctly and without corruption. The video is shown being played by Firefox here, but has since also been tested to work with Chrome, curl and quiche-client.

This is a very visual milestone - it shows not only HTTP/3 working, but both HTTP/1 and HTTP/3 working together on the same thread. As you can see in the picture, an HTTP/1 server is used to instruct (at least Firefox?) the browser to go use the HTTP/3 one instead.