fix our names to wkhtmltopdf's args

def wkhtmltopdf_args_mapping(data):
    """
    fix our names to wkhtmltopdf's args
    """
    mapping = {
        'cookies': 'cookie',
        'custom-headers': 'custom-header',
        'run-scripts': 'run-script'
    }

    return {mapping.get(k, k): v for k, v in data.items()}