'Show that one can iterate over a PR\'s reviews.'

def test_pull_reviews(self):

    cassette_name = self.cassette_name('pull_reviews')
    with self.recorder.use_cassette(cassette_name):
        p = self.get_pull_request(num=671)
        for pull_review in p.reviews():
            assert isinstance(pull_review, github3.pulls.PullReview)
            assert isinstance(pull_review.user, github3.users.ShortUser)
