Update the core changelog since ProcessRunner has gotten a few new methods.

Author: nedtwigg

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]
+### Added
+* `ProcessRunner` has added some convenience methods so it can be used for maven testing. ([#1496](https://github.com/diffplug/spotless/pull/1496))
 
 ## [2.32.0] - 2023-01-13
 ### Added