Add link to my beloved MusicBrainz

dotfiles/bmo/uris.ini

     idos    = http://jizdnirady.idnes.cz/vlakyautobusy/spojeni/
     idosbrq = http://jizdnirady.idnes.cz/brno/spojeni/
     ma      = http://www.mapy.cz/
+    mbr     = https://musicbrainz.org/
     mfp     = http://musicforprogramming.net/
     ol      = http://www.openlmi.org/
     rdt     = https://www.reddit.com/