The version described by the application's release notes.
The release notes version is displayed on the What's New page, above the release notes.
If not set, property@AboutWindow:version will be used instead.
For example, an application with the current version 2.0.2 might want to keep the release notes from 2.0.0, and set the release notes version accordingly.
See property@AboutWindow:release-notes.
Get releaseNotesVersion property.