Update changelog

ffmpeg.spec

@@ -103,7 +103,7 @@ ExclusiveArch: armv7hnl
 Summary:        Digital VCR and streaming server
 Name:           ffmpeg%{?flavor}
 Version:        4.3.1
-Release:        14%{?date}%{?date:git}%{?rel}%{?dist}
+Release:        15%{?date}%{?date:git}%{?rel}%{?dist}
 License:        %{ffmpeg_license}
 URL:            http://ffmpeg.org/
 %if 0%{?date}
@@ -471,6 +471,10 @@ install -pm755 tools/qt-faststart %{buildroot}%{_bindir}
 
 
 %changelog
+* Thu Dec 24 2020 Leigh Scott <leigh123linux@gmail.com> - 4.3.1-15
+- Enable dash demuxer (rfbz#5876)
+- Enable lv2 support (rfbz#5863)
+
 * Mon Dec 14 2020 Leigh Scott <leigh123linux@gmail.com> - 4.3.1-14
 - Actually do the dav1d rebuild