Main method.

def main():
    """
    Main method.
    """
    run_config = _parse_args(sys.argv[1:])
    gitlab_config = GitLabConfig(run_config.url, run_config.token)
    manager = ProjectVariablesManager(gitlab_config, run_config.project)
    output = json.dumps(manager.get(), sort_keys=True, indent=4, separators=(",", ": "))
    print(output)