rss.xml: Add `generator` element.
rss.xml: Add `generator` element.

kasper93/mpc-hc.org,kasper93/mpc-hc.org,FeodorFitsner/mpc-hc.org,Underground78/mpc-hc.org,FeodorFitsner/mpc-hc.org,Underground78/mpc-hc.org,mpc-hc/mpc-hc.org,mpc-hc/mpc-hc.org,FeodorFitsner/mpc-hc.org,Underground78/mpc-hc.org,mpc-hc/mpc-hc.org