CHANGELOG: Prepare for next release

Author: robinst

CHANGELOG.md

@@ -6,7 +6,7 @@ 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
+## [0.13.0] - 2019-07-15
 ### Added
 - `LinkReferenceDefinition` nodes are now part of the document (not
   rendered by default).
@@ -258,6 +258,7 @@ Initial release of commonmark-java, a port of commonmark.js with extensions
 for autolinking URLs, GitHub flavored strikethrough and tables.
 
 
+[0.13.0]: https://github.com/atlassian/commonmark-java/compare/commonmark-parent-0.12.1...commonmark-parent-0.13.0
 [0.12.1]: https://github.com/atlassian/commonmark-java/compare/commonmark-parent-0.11.0...commonmark-parent-0.12.1
 [0.11.0]: https://github.com/atlassian/commonmark-java/compare/commonmark-parent-0.10.0...commonmark-parent-0.11.0
 [0.10.0]: https://github.com/atlassian/commonmark-java/compare/commonmark-parent-0.9.0...commonmark-parent-0.10.0