Update changelog

Author: albertomercurio

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased](https://github.com/qutip/QuantumToolbox.jl/tree/main)
 
+- Introduce `plot_wigner` function for easy plotting of Wigner functions. ([#86], [#292])
 
 
 ## [v0.23.1]
@@ -44,7 +45,9 @@ Release date: 2024-11-13
 [v0.22.0]: https://github.com/qutip/QuantumToolbox.jl/releases/tag/v0.22.0
 [v0.23.0]: https://github.com/qutip/QuantumToolbox.jl/releases/tag/v0.23.0
 [v0.23.1]: https://github.com/qutip/QuantumToolbox.jl/releases/tag/v0.23.1
+[#86]: https://github.com/qutip/QuantumToolbox.jl/issues/86
 [#139]: https://github.com/qutip/QuantumToolbox.jl/issues/139
+[#292]: https://github.com/qutip/QuantumToolbox.jl/issues/292
 [#306]: https://github.com/qutip/QuantumToolbox.jl/issues/306
 [#309]: https://github.com/qutip/QuantumToolbox.jl/issues/309
 [#311]: https://github.com/qutip/QuantumToolbox.jl/issues/311