Get raw lines of the genre file.

def _get_movie_raw_metadata():
    """
    Get raw lines of the genre file.
    """

    path = _get_movielens_path()

    if not os.path.isfile(path):
        _download_movielens(path)

    with zipfile.ZipFile(path) as datafile:
        return datafile.read('ml-100k/u.item').decode(errors='ignore').split('\n')