hyper 0.12 support

[kpcyrd]

I'm currently having issues porting my code to hyper 0.12 and getting it to work with hyper-rustls again.

Currently I'm stuck here:

the trait `hyper::client::connect::Connect` is not implemented for `hyper_rustls::HttpsConnector`

I think a new release might be necessary. Thanks for building rustls and hyper-rustls! :)

[fdubois1]

@kpcyrd : Did you find a way to do tls with hyper 0.12 ?

[kpcyrd]

@fdubois1 hyper-tls is able to use hyper 0.12, but I couldn't find a way to get it to work with rustls yet.

[lucab]

@kpcyrd can you check if #41 works for you?

[kpcyrd]

@lucab I was able to successfully port my application to hyper 0.12 using hyper-rustls from your branch :)