Package versioncli implements a subcommand for obtaining version with the CLI.
CmdVersion returns a "version" subcommand that prints to stdout the given version as well as CIPD package name and the package instance ID if the executable was installed via CIPD.
If the executable didn't come from CIPD, the package information is silently omitted.
'version' will be printed exact as given. The recommended format is "<appname> vMAJOR.MINOR.PATCH".