update changelog

Author: ytdHuang

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Rename `sparse_to_dense` as `to_dense` and `dense_to_sparse` as `to_sparse`. ([#392])
 - Fix erroneous definition of the stochastic term in `smesolve`. ([#393])
 - Change name of `MultiSiteOperator` to `multisite_operator`. ([#394])
+- Fix `smesolve` for specifying initial state as density matrix. ([#395])
 
 ## [v0.26.0]
 Release date: 2025-02-09
@@ -122,3 +123,4 @@ Release date: 2024-11-13
 [#392]: https://github.com/qutip/QuantumToolbox.jl/issues/392
 [#393]: https://github.com/qutip/QuantumToolbox.jl/issues/393
 [#394]: https://github.com/qutip/QuantumToolbox.jl/issues/394
+[#395]: https://github.com/qutip/QuantumToolbox.jl/issues/395