This blog is now served on HTTP/2. It's powered by nginx 1.9.5, which includes experimental support for the protocol.
Enabling HTTP/2 support in nginx is just a matter of adding the http2 option to the listen directive:
listen 443 ssl http2; listen [::]:443 ssl http2;
Previously, I've been using the spdy option to enable the (also experimental) SPDY/3.1 support. From version 1.9.5, this option is superseded in favor of the http2 one.