Changelog: update

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
diff --git a/Changelog b/Changelog
index af0b98d..a1c080d 100644
--- a/Changelog
+++ b/Changelog
@@ -2,6 +2,13 @@
 releases are sorted from youngest to oldest.
 
 version 2.8.9
+- avcodec/flacdec: Fix undefined shift in decode_subframe()
+- avcodec/get_bits: Fix get_sbits_long(0)
+- avformat/ffmdec: Check media type for chunks
+- avcodec/flacdec: Fix signed integer overflow in decode_subframe_fixed()
+- avcodec/flacdsp_template: Fix undefined shift in flac_decorrelate_indep_c
+- avformat/oggparsespeex: Check frames_per_packet and packet_size
+- avformat/utils: Check start/end before computing duration in update_stream_timings()
 - avcodec/flac_parser: Update nb_headers_buffered
 - avformat/idroqdec: Check chunk_size for being too large
 - filmstripdec: correctly check image dimensions