Update examples to use non-legacy client

[hjr3]

Now that #25 has landed, we should make an example that uses the non-legacy client.

[allan2]

There is no higher-level non-legacy client at the moment. Keep as-is until the new one arrives?

Sources:
hyperium/hyper#3414
https://hyper.rs/contrib/roadmap/

[pronebird]

Is it not possible to use this crate with hyper::client::conn::http1::handshake(io) ?

[hjr3]

@pronebird This library wraps HttpConnector, which is part of the legacy package.

If you look at https://hyper.rs/guides/1/client/basic/ you will notice how low level the implementation is. If/when hyper exposes a more high level interface, we can move to that.

What problem(s) are you encountering when using the legacy client?