kwzrd

Tangentially related to #12.

To clarify, I understand that `RedisCache` doesn't attempt to provide an identical interface to a dictionary anymore, for example `update` also doesn't take kwargs or no arguments at all. But...

For testing purposes, you can do this. :trollface: ```py async with self.bot.http_session.get(...) as response: response.status = 500 _raise_for_status(response) ``` The cog is overall not very testable. I have some ideas...