Add changelog entry

Author: Grotax

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 adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Changed
+- Add logic to set the node's link from the <guid> element when isPermaLink="true" and no link is present. (#12)
+
+
+### Fixed
+