Shrink binary data of a png

    returns (api_info, shrunk_data)

def shrink_data(in_data, api_key=None):
    """Shrink binary data of a png

    returns (api_info, shrunk_data)
    """
    info = get_shrink_data_info(in_data, api_key)
    return info, get_shrunk_data(info)