Add APIchanges entry after the recent changes to imgutils.h API of

r25064 and r25067.

Originally committed as revision 25071 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/APIchanges

@@ -13,6 +13,12 @@ libavutil:   2009-03-08
 
 API changes, most recent first:
 
+2010-09-07 - r25067 - lavcore 0.9.0 - av_image_copy()
+  Add av_image_copy().
+
+2010-09-07 - r25064 - lavcore 0.8.0 - av_image_copy_plane()
+  Add av_image_copy_plane().
+
 2010-09-07 - r25057 - lavcore 0.7.0 - imgutils.h
   Adopt hierarchical scheme for the imgutils.h function names,
   deprecate the old names.