Add changelog file (#1962)

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project
+tries to adhere to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+
+## [Unreleased]
+
+### Added
+
+- Started keeping a changelog!
+
+## [0.44.3] - 2025-01-17
+
+### Added
+
+- Add conformance tests for `MPolyRing`, and fix bugs in `^` and `is_unit` for `MPoly` [PR
+  #1950](https://github.com/Nemocas/AbstractAlgebra.jl/pull/1950)
+
+- Add optional `ignore_kwargs` argument to `@attr` macro [PR
+  #1958](https://github.com/Nemocas/AbstractAlgebra.jl/pull/1958)
+
+### Changed
+
+- Don't require `base_ring` in ring conformance tests [issue
+  #1944](https://github.com/Nemocas/AbstractAlgebra.jl/issues/1944) [PR
+  #1946](https://github.com/Nemocas/AbstractAlgebra.jl/pull/1946)
+
+- Fix promotion for matrix-scalar operations [PR
+  #1949](https://github.com/Nemocas/AbstractAlgebra.jl/pull/1949)
+
+- Some internal enhancements
+
+## [0.44.2] - 2024-12-22
+
+### Changed
+
+- Make `is_exact_type` and `is_domain_type` more convenient by
+  having them accept rings and ring elements (not just types) [PR
+  #1942](https://github.com/Nemocas/AbstractAlgebra.jl/pull/1942)
+
+### Fixed
+
+- Fix `is_unit` for univariate and multivariate polynomials over `Z/nZ` [issue
+  #11](https://github.com/Nemocas/AbstractAlgebra.jl/issues/11) [PR
+  #1933](https://github.com/Nemocas/AbstractAlgebra.jl/pull/1933)
+
+- Fix show method for MatSpace [PR #1934](https://github.com/Nemocas/AbstractAlgebra.jl/pull/1934)