Update CHANGELOG.md

CHANGELOG.md

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 # Changelog
 
 ## 1.4.0 - ???
+### New features
+- Added support for exposing a global video texture (_Udon_VideoTex) via the ytdlpPlayer avatar testing prefab. This functionality intended for testing avatar shaders that use a global video texture. The global video texture is **not** something provided by AudioLink outside of in-editor testing - this must be done by a video player. (techanon)
+
 ### Changes
 - Reduced the sizes of various icon textures used by AudioLink. (Teeh)
 - Improved the logic that searches for a yt-dlp excecutable in ytdlpPlayer avatar testing prefab. It should more consistently find the executable accross platforms now. Additionally, the ability to override which executable is used has been added under `Tools > AudioLink > Select Custom YTDL Location`. (techanon)