Update Changelog for 0.5.3 release.


Originally committed as revision 25521 to svn://svn.ffmpeg.org/ffmpeg/branches/0.5
diff --git a/Changelog b/Changelog
index 64d843d..ef46c7f 100644
--- a/Changelog
+++ b/Changelog
@@ -2,6 +2,15 @@
 releases are sorted from youngest to oldest.
 
 
+version 0.5.3:
+
+- build system improvements
+- performance fix for seekable HTTP
+- fix several potentially exploitable issues in the FLIC decoder
+  (addresses CVE-2010-3429)
+
+
+
 version 0.5.2:
 
 - Hurd support