Changelog: update

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
diff --git a/Changelog b/Changelog
index f464aa4..4f2db19 100644
--- a/Changelog
+++ b/Changelog
@@ -4,6 +4,8 @@
 version <next>:
 
 version 3.1.4:
+- avformat/avidec: Check nb_streams in read_gab2_sub()
+- avformat/avidec: Remove ancient assert
 - avfilter/vf_colorspace: fix range for output colorspace option
 - lavc/mediacodecdec_h264: fix SODB escaping
 - avcodec/nvenc: fix const options for hevc gpu setting