Inform about MW 1.32+ compatibility.

NEWS.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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+For changes prior to version 6.0.0, please see [`NEWS.old`](news.old).
+
+## [6.0.0][] - 2019-12-31
+
+### Changed
+
+- Because automatic linking upon page save no longer works with MediaWiki
+  versions 1.32 and newer, the default value of the `$wgLinkTitlesParseOnRender`
+  is now `true`. Please see `README.md` for more information.
+
+### Fixed
+
+- Prevent crash that occurred with MediaWiki version 1.34 due to a renamed
+  constant (DB_SLAVE was renamed to DB_REPLICA). NOTE that the minimum
+  required version of MediaWiki is now 1.28 (which is an obsolete version).
+
+[6.0.0]: https://github.com/bovender/LinkTitles/releases/tag/v6.0.0