Add changelog entries

Author: korthout

CHANGES.md

@@ -10,6 +10,8 @@ This document is intended for Spotless developers.
 We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (starting after version `1.27.0`).
 
 ## [Unreleased]
+### Changed
+* Added support for Markdown with `flexmark` at `0.62.2` ([#1011](https://github.com/diffplug/spotless/pull/1011)).
 
 ## [2.20.3] - 2021-12-15
 ### Fixed

plugin-maven/CHANGES.md

@@ -3,6 +3,8 @@
 We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (starting after version `1.27.0`).
 
 ## [Unreleased]
+### Changed
+* Added support for Markdown with `flexmark` at `0.62.2` ([#1011](https://github.com/diffplug/spotless/pull/1011)).
 
 ## [2.17.7] - 2021-12-16
 ### Fixed