Bump tokio from 1.5.0 to 1.6.0

[dependabot[bot]]

Bumps tokio from 1.5.0 to 1.6.0.

Release notes

Sourced from tokio's releases.

Tokio v1.6.0

1.6.0 (May 14, 2021)

Added

• fs: try doing a non-blocking read before punting to the threadpool (#3518)
• io: add write_all_buf to AsyncWriteExt (#3737)
• io: implement AsyncSeek for BufReader, BufWriter, and BufStream (#3491)
• net: support non-blocking vectored I/O (#3761)
• sync: add mpsc::Sender::{reserve_owned, try_reserve_owned} (#3704)
• sync: add a MutexGuard::map method that returns a MappedMutexGuard (#2472)
• time: add getter for Interval's period (#3705)

Fixed

• io: wake pending writers on DuplexStream close (#3756)
• process: avoid redundant effort to reap orphan processes (#3743)
• signal: use std::os::raw::c_int instead of libc::c_int on public API (#3774)
• sync: preserve permit state in notify_waiters (#3660)
• task: update JoinHandle panic message (#3727)
• time: prevent time::advance from going too far (#3712)

Documented

• net: hide net::unix::datagram module from docs (#3775)
• process: updated example (#3748)
• sync: Barrier doc should use task, not thread (#3780)
• task: update documentation on block_in_place (#3753)

Commits

• 580dc95 chore: prepare Tokio v1.6.0 (#3782)
• 8c395df io: impl AsyncSeek for BufReader/BufWriter/BufStream (#3491)
• e188e99 process: avoid redundant effort to reap orphan processes (#3743)
• 0b93bd5 net: support non-blocking vectored I/O (#3761)
• d846bf2 sync: Barrier doc should use task, not thread (#3780)
• 9ff7d8c net: hide net::unix::datagram module from docs (#3775)
• 8324317 doc: fix doc-cfg on io::duplex, io::copy_bidirectional, and task::unconstrain...
• 7207e3c signal: use std::os::raw::c_int instead of libc::c_int on public API (#3774)
• 312321c chore: enable syntax highlighting for toml in readme
• 17c7ce6 benches: fix build error (#3769)
• Additional commits viewable in compare view

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