Upgrade hyper client to stablised hyper 1.0 version/API

[liamwh]

https://seanmonstar.com/blog/hyper-v1/

[andyblarblar]

So I gave this a go, and it seems like this wont be possible until Isach upgrades http to v1, as currently hyper and isach use different http versions. We could technically cfg around this, but it would make a mess of the codebase for minimal gains. Once that is done as well, it looks like it'll be a bit of a pain to migrate to http v1 as well.

Not to say this wont be done at some point, but I'm going to wait things to mature a little before putting the effort required.