Update the lib changelog.

Author: nedtwigg

CHANGES.md

@@ -12,6 +12,8 @@ We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (
 ## [Unreleased]
 ### Added
 * `DiffMessageFormatter` can now generate messages based on a folder of cleaned files, as an alternative to a `Formatter` ([#982](https://github.com/diffplug/spotless/pull/982)).
+### Fixed
+* Fix CI and various spotbugs nits ([#988](https://github.com/diffplug/spotless/pull/988)).
 
 ## [2.19.2] - 2021-10-26
 ### Changed