Added changelog entry

Author: KoenZomers

CHANGELOG.md

@@ -32,6 +32,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Added `-HidePeoplePreviewingFiles` to `Set-PnPSite` which allows for hiding the people previewing files feature on a site [#4416](https://github.com/pnp/powershell/pull/4416)
 - Added `-AllowWebPropertyBagUpdateWhenDenyAddAndCustomizePagesIsEnabled` to `Set-PnPTenant` which allows for updating of web property bag when DenyAddAndCustomizePages is enabled [#4508](https://github.com/pnp/powershell/pull/4508)
 - Added `SiteId` to the output of `Get-PnPTenantSite` [#4527](https://github.com/pnp/powershell/pull/4527)
+- Added `Add-PnPFileSensitivityLabel` which allows for assigning sensitivity labels to SharePoint files [#4538](https://github.com/pnp/powershell/pull/4538)
 
 ### Changed