Option `--version` not available

It would be nice to have.

joao@librem:~$ gnome-calls --version
Unknown option --version
joao@librem:~$ 

joao@librem:~$ gnome-calls --help
Usage:
  gnome-calls [OPTION…]

Help Options:
  -h, --help                 Show help options
  --help-all                 Show all help options
  --help-gapplication        Show GApplication options
  --help-gtk                 Show GTK+ Options

Application Options:
  -p, --provider=PLUGIN      The name of the plugin to use for the call Provider
  -d, --daemon               Whether to present the main window on startup
  -l, --dial=NUMBER          Dial a number
  --display=DISPLAY          X display to use