docs: update release notes for autoloop destaddr

Author: GeorgeTsagk

release_notes.md

@@ -15,6 +15,7 @@ This file tracks release notes for the loop client.
 ## Next release
 
 #### New Features
+* Autoloop now has a new parameter named `destaddr` which if set to a valid bitcoin address will direct all funds from automatically dispatched loop outs towards that address.
 
 #### Breaking Changes
 * Listing loop-in swaps will not display old, nested segwit swap htlc addresses correctly anymore since