Bump tokio from 0.2.21 to 1.0.3

[dependabot]

Bumps tokio from 0.2.21 to 1.0.3.

Release notes

Sourced from tokio's releases.

Tokio v1.0.3

Fixed

• io: memory leak during shutdown (#3477).

Tokio v1.0.2

Fixed

• io: soundness in read_to_end (#3428).

Tokio v1.0.1

This release fixes a soundness hole caused by the combination of RwLockWriteGuard::map and RwLockWriteGuard::downgrade by removing the map function. This is a breaking change, but breaking changes are allowed under our semver policy when they are required to fix a soundness hole. (See this RFC for more.)

Note that we have chosen not to do a deprecation cycle or similar because Tokio 1.0.0 was released two days ago, and therefore the impact should be minimal.

Due to the soundness hole, we have also yanked Tokio version 1.0.0.

Removed

• sync: remove RwLockWriteGuard::map and RwLockWriteGuard::try_map (#3345)

Fixed

• docs: remove stream feature from docs (#3335)

Tokio v1.0.0

Commit to the API and long-term support.

Announcement and more details.

Fixed

• sync: spurious wakeup in watch (#3234).

Changed

• io: rename AsyncFd::with_io() to try_io() (#3306)
• fs: avoid OS specific *Ext traits in favor of conditionally defining the fn (#3264).
• fs: Sleep is !Unpin (#3278).
• net: pass SocketAddr by value (#3125).
• net: TcpStream::poll_peek takes ReadBuf (#3259).
• rt: rename runtime::Builder::max_threads() to max_blocking_threads() (#3287).
• time: require current_thread runtime when calling time::pause() (#3289).

Removed

• remove tokio::prelude (#3299).
• io: remove AsyncFd::with_poll() (#3306).
• net: remove {Tcp,Unix}Stream::shutdown() in favor of AsyncWrite::shutdown() (#3298).
• stream: move all stream utilities to tokio-stream until Stream is added to std (#3277).
• sync: mpsc try_recv() due to unexpected behavior (#3263).
• tracing: make unstable as tracing-core is not 1.0 yet (#3266).

... (truncated)

Commits

• 5d0a81f io: fix memory leak during shutdown (#3477)
• 5d35c90 chore: release tokio v1.0.2 (#3429)
• ad8fb41 io: fix unsoundness in read_to_end (#3428)
• 2330edc chore: prepare tokio 1.0.1 release (#3347)
• fe2664a sync: remove RwLockWriteGuard::map and RwLockWriteGuard::try_map (#3345)
• 1eefbc2 docs: remove stream feature from docs (#3335)
• a66017f chore: prepare Tokio 1.0 release (#3319)
• aa6597b compat: update traits naming to match tokio 1.0 (#3324)
• ce0e9c6 chore: Revert "use #[non_exhaustive] instead of private unit field" (#3323)
• 575938d chore: use #[non_exhaustive] instead of private unit field (#3320)
• Additional commits viewable in compare view

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