CFBundleShortVersionString
The release or version number of the bundle.
Discussion
This key is a user-visible string for the version of the bundle. The required format is three period-separated integers, such as 10.14.1. The string can only contain numeric characters (0-9) and periods.
Each integer provides information about the release in the format [Major].[Minor].[Patch]:
Major: A major revision number.
Minor: A minor revision number.
Patch: A maintenance release number.
This key is used throughout the system to identify the version of the bundle.