add changelog for 0.13.0

Author: KarnerTh

changelog.md

@@ -4,9 +4,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres
 to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) (after version 0.0.5).
 
-## Unreleased
+## [0.13.0] - 2025-12-17
 ### Changed
 - go 1.24 is now used
+- updated dependencies
+- choose MSSQL connection driver dynamically ([PR #70](https://github.com/KarnerTh/mermerd/pull/70))
+
+### Fixed
+- fix PostgreSQL queries to handle duplicate constraint names across schemas ([PR #72](https://github.com/KarnerTh/mermerd/pull/72))
 
 ## [0.12.0] - 2024-11-10
 ### Added