Properly convert Score.perfect to bool

[christopher-dG]

Bug:

>>> scores = api.get_scores(beatmap_id=129891, username='cookiezi')
>>> scores[1].score_id, scores[1].countmiss, scores[1].perfect
(2266240534, 1, True)
>>> scores = requests.get("https://osu.ppy.sh/api/get_scores?k=%s&u=cookiezi&b=129891" % os.environ["OSU_API_KEY"]).json()
>>> scores[1]["score_id"], scores[1]["countmiss"], scores[1]["perfect"]
('2266240534', '1', '0')

Reason:

>>> bool("0")
True

As an aside, this code is really easy to work with :smile:

[khazhyk]

Thanks! It looks like the other places that use bool need this too... I'll probably do that before pushing this to a release