Make changelog

Author: albertomercurio

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Change default solver detection in `eigensolve` when using `sigma` keyword argument (shift-inverse algorithm). If the operator is a `SparseMatrixCSC`, the default solver is `UMFPACKFactorization`, otherwise it is automatically chosen by LinearSolve.jl, depending on the type of the operator. ([#580]) 
 - Add keyword argument `assume_hermitian` to `liouvillian`. This allows users to disable the assumption that the Hamiltonian is Hermitian. ([#581])
 - Use LinearSolve's internal methods for preconditioners in `SteadyStateLinearSolver`. ([#588])
+- Use `FillArrays.jl` for handling superoperators. This makes the code cleaner and potentially more efficient. ([#589])
 
 ## [v0.38.1]
 Release date: 2025-10-27
@@ -364,3 +365,4 @@ Release date: 2024-11-13
 [#580]: https://github.com/qutip/QuantumToolbox.jl/issues/580
 [#581]: https://github.com/qutip/QuantumToolbox.jl/issues/581
 [#588]: https://github.com/qutip/QuantumToolbox.jl/issues/588
+[#589]: https://github.com/qutip/QuantumToolbox.jl/issues/589