Upgrade to Tokio 0.3

[zupzup]

With Tokio 0.3 out, it would be nice to update, especially since this is supposed to be the last version before 1.0

There is already an updated version of tokio-postgres

For redis, there is an issue to upgrade as well.

[importcjj]

Sorry for late. I just published 0.6.0 for mobc and mobc-postgres.
If you are still using mobc, feedbacks is welcomed, and I will fix them as soon as possible.

[zupzup]

That's fantastic, thank you so much!