Fix changelog

Author: TendonFFF

CHANGELOG.md

@@ -6,12 +6,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased](https://github.com/qutip/QuantumToolbox.jl/tree/main)
+- Add error message for bad input in state/operator generating functions ([#603])
 
 ## [v0.39.1]
 Release date: 2025-11-19
 
 - Add `spre` and `spost` methods for `ComposedOperator` and cache propagator in every time evolution solver. ([#596])
-- Add error message for bad input in state/operator generating functions ([#603])
 
 ## [v0.39.0]
 Release date: 2025-11-17