docs: add release notes

Author: ffranr

docs/release-notes/release-notes-0.7.0.md

@@ -72,6 +72,7 @@
    - https://github.com/lightninglabs/taproot-assets/pull/1716
    - https://github.com/lightninglabs/taproot-assets/pull/1675
    - https://github.com/lightninglabs/taproot-assets/pull/1674
+   - https://github.com/lightninglabs/taproot-assets/pull/1784
 
 - A new [address version 2 was introduced that supports grouped assets and
   custom (sender-defined)