docs: def main():
      """"This main function implements the CLI"""
      parser = argparse.ArgumentParser(description='Do something awesome')
      parser.add_argument('input_file', nargs=1,
                          type=argparse.FileType('r'))
      parser.add_argument('-o', '--outfile', nargs='?',
                          type=argparse.FileType('w'), default=sys.stdout)
      args = parser.parse_args()
  
      print(json_to_csv(args.input_file[0].read()), file=args.outfile)