Changelog: update

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
diff --git a/Changelog b/Changelog
index 5d2d645..7df4e19 100644
--- a/Changelog
+++ b/Changelog
@@ -2,6 +2,9 @@
 releases are sorted from youngest to oldest.
 
 version 4.1.2:
+- avcodec/dfa: Check the chunk header is not truncated
+- avcodec/clearvideo: Check remaining data in P frames
+- avcodec/hevcdec: decode at most one slice reporting being the first in the picture
 - avcodec/dvbsubdec: Check object position
 - avcodec/cdgraphics: Use ff_set_dimensions()
 - avformat/gdv: Check fps