docs: update changelog for v1.12.0

Author: lukecotter

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
-## [Unreleased]
+## [1.12.0] - 2023-12-05
 
 ### Added
 
@@ -306,7 +306,7 @@ Skipped due to adopting odd numbering for pre releases and even number for relea
 - Add explorer menu item
 - Provide more information when selecting log to download
 
-<!-- Unreleased -->
+<!-- v1.12.0 -->
 
 [#311]: https://github.com/certinia/debug-log-analyzer/issues/311
 [#336]: https://github.com/certinia/debug-log-analyzer/issues/336