Update changelog.

Author: nedtwigg

Diff for: CHANGELOG.md

@@ -5,6 +5,9 @@ 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).
 
 ## [Unreleased]
+### Fixed
+- In addition to `GRGIT_USER`, `GRGIT_PASS`, and `gh_token`, we also now look for:
+  - `GH_TOKEN`, `GITHUB_TOKEN` ([#53](https://github.com/diffplug/spotless-changelog/pull/53))
 
 ## [3.1.1] - 2024-07-06
 ### Fixed