[scripts.cli] Add version option

src/idiap_devtools/scripts/cli.py

@@ -16,6 +16,7 @@ from .update_pins import update_pins
     cls=AliasedGroup,
     context_settings=dict(help_option_names=["-?", "-h", "--help"]),
 )
+@click.version_option()
 def cli():
     """Idiap development tools - see available commands below."""
     pass