Update Changelog for 0.5.2 release.


Originally committed as revision 23298 to svn://svn.ffmpeg.org/ffmpeg/branches/0.5
diff --git a/Changelog b/Changelog
index ce4f0e4..64d843d 100644
--- a/Changelog
+++ b/Changelog
@@ -2,6 +2,14 @@
 releases are sorted from youngest to oldest.
 
 
+version 0.5.2:
+
+- Hurd support
+- PowerPC without Altivec compilation issues
+- validate channels and samplerate in the Vorbis decoder
+
+
+
 version 0.5.1:
 
 - build system updates