chore: Prepare 0.6.2 (hyperium#860)

- Contains the revert to [rust 2018](hyperium#847).
- Bumps both tonic and tonic-build.
- tonic-build goes from 0.6.0 to 0.6.2 since there was no 0.6.1. I
  believe we want tonic and tonic-build versions to follow each other.

chore: Prepare 0.6.1 (hyperium#814)

chore: Prepare `0.6.0` release (hyperium#811)

chore: Prepare tonic v0.5.2 (hyperium#738)

So as highlighted by
hyperium#730 (comment) it
turns out the new `Interceptor` trait required changes to tonic-build as
well, which I forgot to publish yesterday. Didn't see it because it wasn't
clear from the commit message.

So this bumps tonic _and_ tonic-build to 0.5.2 so we can release both.
There are no code changes.

chore: Prepare tonic v0.5.1 and tonic-health 0.4.1 (hyperium#737)

Fix tonic-types and health versions

chore: Prepare tonic `0.4.3` (hyperium#617)

* chore: Prepare tonic `0.4.3`

* Small typo fix

chore: Prepare tonic `0.4.2` and health `0.3.1` (hyperium#605)

Prepare `0.4.1` release (hyperium#580)

Fix `tonic-health` cargo path issues