Add APIchanges entry after r25225.

Originally committed as revision 25226 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/APIchanges

@@ -13,6 +13,10 @@ libavutil:   2009-03-08
 
 API changes, most recent first:
 
+2010-09-27 - r25225 - lavu 50.30.0 - av_get_token()
+  Move av_get_token() from libavfilter/parseutils.h to
+  libavutil/avstring.h.
+
 2010-09-26 - r25210 - lavu 50.29.0 - opt.h
   Move libavcodec/opt.h to libavutil/opt.h.