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This PR upgrades Tokio to v0.3.
Unfortunately, Tokio (temporarily) dropped support for
set_keepalive
, so I had to comment this out for now. See these issues for details:tokio-rs/tokio#3082
tokio-rs/tokio#3109
I'm not sure how important this
set_keepalive
is to you. Depending on that, we might have to wait until Tokio adds it back, or we could just throw it out entirely (since no backend supports it now).