keep pace with redis-py for zrevrange method

[bkda]

I just tried to use fakeredis to test my code, e.g.

data = redis.zrevrange(cls.KEY.format(challenge_id=challenge_id), start=offset, end=offset + limit,
                                       withscores=True)

And I found type error:

TypeError: zrevrange() got an unexpected keyword argument 'end'

So maybe it's better to keep pace with redis-py on zrevrange method?
Also you can check here

Cheers.

[coveralls]

Coverage remained the same at 98.484% when pulling 310cfb1 on da2018:master into eb2eb27 on jamesls:master.

[bmerry]

Thanks!