Tonic: Upgrade to `tokio` 0.2

[LucioFranco]

Blockers:

• [x] tower-service 0.3
• [x] hyper 0.13
• [x] Update all the smaller tower services

[joelgallant]

https://github.com/tower-rs/tower/issues/367
https://github.com/hyperium/hyper/issues/2025

just for anyone who ran into all possible versions conflict with previously selected packages. when using tokio '0.2'

[LucioFranco]

Hey! Yup, were working on getting hyper out this week, there still needs to be an update to all the tower services we use so I am focusing on that. Once, all those are done tonic can be released as a 0.1.

[LucioFranco]

This has been done in #163 and is on master!

[reyk]

Hi, are there any plans to release the tokio-0.2-compatible crate soon?

[LucioFranco]

Yeah, I have been waiting on some of our dependencies, I am gonna try to get a beta out today/tomorrow.

[reyk]

That would be great!