docs: update release notes

bhandras · bhandras · commit 5f4b34d8b4ee · 2022-06-30T17:00:00.000+02:00
diff --git a/release_notes.md b/release_notes.md
@@ -16,6 +16,8 @@ This file tracks release notes for the loop client.
 
 #### New Features
 
+* P2TR HTLCs and privacy preserving and cheaper MuSig2 loopout sweeps are now supported as an experimental feature when running `loopd` with the`--experimental` flag.
+
 #### Breaking Changes
 
 #### Bug Fixes
