Update CHANGELOG.md

Author: fgrosse

CHANGELOG.md

@@ -5,7 +5,8 @@ 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]
-_Nothing yet_
+- Fix issue when coverage artifact contains more files than just the `coverage.txt` file (fgrosse/go-coverage-report#25)
+- Improve `README.md` information about limitations of this action (fgrosse/go-coverage-report#24 and fgrosse/go-coverage-report#15)
 
 ## [v1.0.1] - 2024-04-26
 - Show coverage report also if only test files changed (fgrosse/go-coverage-report#20)