ListSwap Update: Update release note

Author: kornpow

release_notes.md

@@ -15,6 +15,12 @@ This file tracks release notes for the loop client.
 ## Next release
 
 #### New Features
+* [Enhance](https://github.com/lightninglabs/loop/pull/912) the
+  `loop listswaps` command by improving the ability to filter the 
+  response.  Use `--start_timestamp_ns` to return only swaps after
+  that timestamp. Use `--max_swaps` to limit total swap outputs.
+  Paging is enabled using the `next_start_time` field in the response.
+
 
 #### Breaking Changes