improve changelog

Author: mateuszbaran

Changelog.md

@@ -6,18 +6,21 @@ The file was started with Version `0.4`.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [0.5.28] November 17, 2025
+
+### Changed
+
+* Unified the interfaces for line search related functions, especially,
+  * `linesearch_backtrack(M, F, p, X, s, decrease, contract, η, f0; kwargs...)` now has `lf0=` and `gradient=` keyword arguments instead of positional ones for `X` and the last `f0`, respectively. It additionally has a `Dlf0=` keyword argument to pass the evaluated differential instead of the gradient, which otherwise defaults to calling the inner product.
+* Refactor the nonmonotone linesearch stepsize to have an initial guess that can be set. For now it still afterwards performs the Barzilai-Borwein initial guess,
+so a constant initial guess is recommended here. The initial guess may be refactored in the future in a non-breaking release and the meaning of the initial guess in nonmonotone line search may change.
 
 ### Fixed
 
 * Change the construction of the product manifold in `interior_point_newton` from `×` to `ProductManifold`, so that the algorithm also work on Product manifolds `M`, where it now correctly wraps `M` instead of extending it.
-* unifies the doc strings for constrained problems
-* fixes a few typos in the doc strings of matrix update formulae within the quasi-Newton and CG solver.
-* unified the interfaces for line search related functions, especially,
-  * `linesearch_backtrack(M, F, p, X, s, decrease, contract, η, f0; kwargs...)` now has `lf0=` and `gradient=` keyword arguments instead of positional ones for `X` and the last `f0`, respectively. It additionally has a `Dlf0=` keyword argument to pass the evaluated differential instead of the gradient, which otherwise defaults to calling the inner product.
-* refactor the nonmonotone linesearch stepsize to have an initial guess that can be set. For now it still afterwards performs the Barzilein Borwein initial guess,
-so a constant initial guess is recommended here for not.
-* covers one last line in `proximal_gradient_plan`
+* Unified the doc strings for constrained problems.
+* Fixed a few typos in the doc strings of matrix update formulae within the quasi-Newton and CG solver.
+* Covered one last line in `proximal_gradient_plan`
 
 ## [0.5.27] November 11, 2025