add dshow maintainer

Signed-off-by: rogerdpack <rogerpack2005@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

MAINTAINERS

@@ -270,7 +270,7 @@ libavdevice
   libdc1394.c                           Roman Shaposhnik
   v4l2.c                                Luca Abeni
   vfwcap.c                              Ramiro Polla
-
+  dshow.c                               Roger Pack
 
 libavfilter
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