Update changelog.

Author: nedtwigg

CHANGES.md

@@ -10,6 +10,10 @@ 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
+* `FileSignature.Promised` and `JarState.Promised` to facilitate round-trip serialization for the Gradle configuration cache. ([#1945](https://github.com/diffplug/spotless/pull/1945)) 
+### Removed
+* **BREAKING** Remove `JarState.getMavenCoordinate(String prefix)`. ([#1945](https://github.com/diffplug/spotless/pull/1945))
 
 ## [2.45.0] - 2024-01-23
 ### Added