No changes to functionality - but I removed all of the testing code from the release package.
There is no need to install this version if you already have v5.0.3 installed - it won't fix the problem and there is no new code.
If you have already installed 5.0.3 and you want to clean up the additional files, you can safely remove the following files and directories under src/addons/Hampel/WhatsNewDigest/...:
- composer.json
- composer.lock
- phpunit.xml
- tests/
- vendor/
The upgrade process doesn't delete the additional files, but it won't do any harm to leave them there.