Changelog: add entries for the SMPTE VC-2 decoder and encoder

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
diff --git a/Changelog b/Changelog
index 90964f0..96a9955 100644
--- a/Changelog
+++ b/Changelog
@@ -70,6 +70,8 @@
 - streamselect video and astreamselect audio filter
 - swaprect filter
 - metadata video and ametadata audio filter
+- SMPTE VC-2 HQ profile support for the Dirac decoder
+- SMPTE VC-2 native encoder supporting the HQ profile
 
 
 version 2.8: