Update to std-future

[95th]

Closes #38.

Uses tokio-tls

[sfackler]

It seems like this should just wrap tokio-tls to avoid re-implementing all of that stuff.

[jakubadamw]

I've a got a WIP branch here: https://github.com/jakubadamw/hyper-tls/tree/tokio-tls. It is, however, blocked on a small change to tokio-tls that would make TlsStream a Send type again, as it was accidentally made non-Send during the move to std::futures.

[jakubadamw]

tokio_tls::TlsStream will be made Send again after tokio-rs/tokio#1317.

@95th, if you don't mind, when that's merged in, I'll pick up my branch, cherry-pick your fixes to examples and create a PR. OK?

[95th]

@jakubadamw By all means, please go ahead.

[jakubadamw]

@95th, I rebased my branch against yours but I got stuck on just one remaining error in my changes. It seems I need to read up more carefully on Pin and Unpin before I can solve it, so if you feel like picking up my branch and taking a look, I will not mind either!

This is what I'm getting:

error[E0599]: no method named `poll` found for type `std::pin::Pin<&mut std::boxed::Box<(dyn core::future::future::Future<Output = std::result::Result<(stream::MaybeHttpsStream<T>, hyper::client::connect::Connected), std::io::Error>> + std::marker::Send + 'static)>>` in the current scope
   --> src\client.rs:134:31
    |
134 |         Pin::new(&mut self.0).poll(cx)
    |                               ^^^^
    |
    = note: the method `poll` exists but the following trait bounds were not satisfied:
            `std::boxed::Box<(dyn core::future::future::Future<Output = std::result::Result<(stream::MaybeHttpsStream<T>, hyper::client::connect::Connected), std::io::Error>> + std::marker::Send + 'static)> : core::future::future::Future`

Adding an Unpin bound to BoxFut doesn't quite help as then it complains about the GenFuture returned by TlsConnector::connect() (as that's an async fn) not being Unpin.

[95th]

@jakubadamw I fixed that issue and made a PR to your repo. Do you want to create a separate PR or do you want to merge your changes in this PR itself?

[jakubadamw]

@95th, great, thanks! Please go ahead and just carry all over to this PR. :)

Oh, and if it turns out to be necessary, feel free to just squash away my commit.

[95th]

@jakubadamw Done. Thanks

[seanmonstar]

Excellent, thanks!