* Only log the $_SERVER information under YII_DEBUG
Since $_SERVER can contain sensitive information that could leak in CI pipelines ideally it should happen under the YII_DEBUG flag only
* Added upgrade / changelog
* Corrected the upgrade information
* Update framework/UPGRADE.md
Co-authored-by: Alexander Makarov <sam@rmcreative.ru>
Co-authored-by: Bizley <pawel@positive.codes>
Co-authored-by: Alexander Makarov <sam@rmcreative.ru>