Prepare CHANGELOG for version 0.27.1

Author: robinst

CHANGELOG.md

@@ -6,11 +6,13 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 This project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html),
 with the exception that 0.x versions can break between minor versions.
 
-## [Unreleased]
+## [0.27.1] - 2026-01-14
 ### Fixed
 - Line(s) after a hard line break would sometimes also get an unwanted hard
   line break, e.g. if they ended in emphasis or other non-text inlines (#415)
 - `TextContentRenderer` (for plain text): Fix nested lists on the same line (#413)
+- Fix minor performance regression with pathological input (deeply nested
+  brackets) that was introduced in version 0.23.0.
 
 ## [0.27.0] - 2025-10-12
 ### Added
@@ -516,7 +518,7 @@ API breaking changes (caused by changes in spec):
 Initial release of commonmark-java, a port of commonmark.js with extensions
 for autolinking URLs, GitHub flavored strikethrough and tables.
 
-[Unreleased]: https://github.com/commonmark/commonmark-java/compare/commonmark-parent-0.27.0...main
+[0.27.1]: https://github.com/commonmark/commonmark-java/compare/commonmark-parent-0.27.0...commonmark-parent-0.27.1
 [0.27.0]: https://github.com/commonmark/commonmark-java/compare/commonmark-parent-0.26.0...commonmark-parent-0.27.0
 [0.26.0]: https://github.com/commonmark/commonmark-java/compare/commonmark-parent-0.25.1...commonmark-parent-0.26.0
 [0.25.1]: https://github.com/commonmark/commonmark-java/compare/commonmark-parent-0.25.0...commonmark-parent-0.25.1