about.rst: about license info for MediaInfo and ZenLib
about.rst: about license info for MediaInfo and ZenLib

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