added reference to Gmane mailing list archive
added reference to Gmane mailing list archive

rockdaboot/libpsl,rockdaboot/libpsl,darnir/libpsl,dago/libpsl,darnir/libpsl,dago/libpsl,dago/libpsl,dkg/libpsl,rockdaboot/libpsl,darnir/libpsl,dkg/libpsl