How to use the fontmake.__version__ function in fontmake

def main(args=None):
    parser = ArgumentParser()
    parser.add_argument("--version", action="version", version=__version__)
    inputGroup = parser.add_argument_group(
        title="Input arguments",
        description="The following arguments are mutually exclusive (pick only one):",
    )
    xInputGroup = inputGroup.add_mutually_exclusive_group(required=True)
    xInputGroup.add_argument(
        "-g", "--glyphs-path", metavar="GLYPHS", help="Path to .glyphs source file"
    )
    xInputGroup.add_argument(
        "-u",
        "--ufo-paths",
        nargs="+",
        metavar="UFO",
        help="One or more paths to UFO files",
    )
    xInputGroup.add_argument(