'Download a cover and put it into result_queue. The parameters all have
the same meaning as for :meth:`identify`. Put (self, cover_data) into
result_queue.
This method should use cached cover URLs for efficiency whenever
possible. When cached data is not present, most plugins simply call
identify and use its results.
If the parameter get_best_cover is True and this plugin can get
multiple covers, it should only get the "best" one.'

def download_cover(self, log, result_queue, abort, title=None, authors=None, identifiers={}, timeout=30, get_best_cover=False):

    pass
