Add to changelog and bump version to 0.4.0

Author: akirakyle

CHANGELOG.md

@@ -1,5 +1,17 @@
 # News
 
+## v0.4.0 - 2025-04-05
+
+This version implements the RFC in #40 without deprecating anything. Future versions will first add deprecation warnings before removing any existing interfaces.
+
+- Eliminate all type parameters from `StateVector`, `AbstractKet`, `AbstractBra`, `AbstractOperator`, and `AbstractSuperOperator`.
+- Implement new basis checking interface consisting of `multiplicable`, `addible`, `check_multiplicable`, `check_addible`, and `@compatiblebases`.
+- Add `basis_l` and `basis_r` to get left and right bases of operators. 
+- Implement `getindex` for `CompositeBasis` and `SumBasis`.
+- Add method interface to existing subtypes of `Bases`: `spinnumber`, `cutoff`, `offset`.
+- Add `KetBraBasis`, `ChoiRefSysBasis`, `ChoiOutSysBasis`, and `_PauliBasis`. Note that eventually `_PauliBasis` will be renamed to `PauliBasis`.
+- Change internal fields and constructors for subtypes of `Basis`.
+
 ## v0.3.10 - 2025-04-06
 
 - Deprecate `PauliBasis` as it is identical to `SpinBasis(1//2)^N` but without the compatibility with `CompositeBasis`.

Project.toml

@@ -1,7 +1,7 @@
 name = "QuantumInterface"
 uuid = "5717a53b-5d69-4fa3-b976-0bf2f97ca1e5"
 authors = ["QuantumInterface.jl contributors"]
-version = "0.3.9"
+version = "0.4.0"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"