docs: update changelog version for v1.18.0 release

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]
+## [1.18.0] 2025-07-09
 
 ### Added
 
@@ -386,7 +386,7 @@ 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 -->
+<!-- v1.18.0 -->
 
 [#504]: https://github.com/certinia/debug-log-analyzer/issues/504
 [#581]: https://github.com/certinia/debug-log-analyzer/issues/581