List myself as the maintainer of celp_filters.*

Originally committed as revision 20883 to svn://svn.ffmpeg.org/ffmpeg/trunk

MAINTAINERS

@@ -114,6 +114,7 @@ Codecs:
   atrac3*                               Benjamin Larsson
   bmp.c                                 Mans Rullgard, Kostya Shishkov
   cavs*                                 Stefan Gehrer
+  celp_filters.*                        Vitor Sessak
   cinepak.c                             Roberto Togni
   cljr                                  Alex Beregszaszi
   cook.c, cookdata.h                    Benjamin Larsson