move changelog update to unreleased

Author: Jiloc

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to the versioning scheme outlined in the [README.md](README.md).
 
+# Unreleased
+
+### Changed
+
+- Changed default mempool walk strategy to `NextNonceWithHighestFeeRate`
+
 ## [3.1.0.0.11]
 
 - Hotfix for p2p stack misbehavior in mempool syncing conditions
@@ -30,7 +36,6 @@ and this project adheres to the versioning scheme outlined in the [README.md](RE
 - Reduce the default `block_rejection_timeout_steps` configuration so that miners will retry faster when blocks fail to reach 70% approved or 30% rejected.
 - Added index for `next_ready_nakamoto_block()` which improves block processing performance.
 - Added a new field, `parent_burn_block_hash`, to the payload that is included in the `/new_burn_block` event observer payload.
-- Changed default mempool walk strategy to `NextNonceWithHighestFeeRate`
 
 ### Fixed