Commits on Jan 30, 2018

1. feat(client): redesign the Connect trait …

   The original `Connect` trait had some limitations:
   
   - There was no way to provide more details to the connector about how to
     connect, other than the `Uri`.
   - There was no way for the connector to return any extra information
     about the connected transport.
   - The `Error` was forced to be an `std::io::Error`.
   - The transport and future had `'static` requirements.
   
   As hyper gains HTTP/2 support, some of these things needed to be
   changed. We want to allow the user to configure whether they hope to
   us ALPN to start an HTTP/2 connection, and the connector needs to be
   able to return back to hyper if it did so.
   
   The new `Connect2` trait is meant to solve this.
   
   - The `connect` method now receives a `Destination` type, instead of a
     `Uri`. This allows us to include additional data about how to connect.
   - The `Future` returned from `connect` now must be a tuple of the
     transport, and a `Connected` metadata value. The `Connected` includes
     possibly extra data about what happened when connecting.
   
   The `Connect` trait is deprecated, with the hopes of `Connect2` taking
   it's place in the next breaking release. For backwards compatibility,
   any type that implements `Connect` now will automatically implement
   `Connect2`, ignoring any of the extra data from `Destination` and
   `Connected`.

   

   seanmonstar committed Jan 30, 2018
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