update changelog

Author: ytdHuang

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased](https://github.com/qutip/QuantumToolbox.jl/tree/main)
 
+## [v0.33.1]
+Release date: 2025-07-22
+
+- Support `SciMLOperators v1`. ([#470])
+
 ## [v0.33.0]
 Release date: 2025-07-22
 
@@ -187,6 +192,7 @@ Release date: 2024-11-13
 [v0.32.0]: https://github.com/qutip/QuantumToolbox.jl/releases/tag/v0.32.0
 [v0.32.1]: https://github.com/qutip/QuantumToolbox.jl/releases/tag/v0.32.1
 [v0.33.0]: https://github.com/qutip/QuantumToolbox.jl/releases/tag/v0.33.0
+[v0.33.1]: https://github.com/qutip/QuantumToolbox.jl/releases/tag/v0.33.1
 [#86]: https://github.com/qutip/QuantumToolbox.jl/issues/86
 [#139]: https://github.com/qutip/QuantumToolbox.jl/issues/139
 [#271]: https://github.com/qutip/QuantumToolbox.jl/issues/271
@@ -253,6 +259,7 @@ Release date: 2024-11-13
 [#455]: https://github.com/qutip/QuantumToolbox.jl/issues/455
 [#456]: https://github.com/qutip/QuantumToolbox.jl/issues/456
 [#460]: https://github.com/qutip/QuantumToolbox.jl/issues/460
+[#470]: https://github.com/qutip/QuantumToolbox.jl/issues/470
 [#472]: https://github.com/qutip/QuantumToolbox.jl/issues/472
 [#473]: https://github.com/qutip/QuantumToolbox.jl/issues/473
 [#476]: https://github.com/qutip/QuantumToolbox.jl/issues/476