Update smelling_salts requirement from 0.2 to 0.3

[dependabot]

Updates the requirements on smelling_salts to permit the latest version.

Changelog

Sourced from smelling_salts's changelog.

[0.3.0] - 2021-06-24

Changed

• Rename Device::register_waker() to Device::sleep(), which now additionally returns Poll::Pending and now requires a mutable reference.
• Rename Device::old() to Device::stop(), which now additionally returns the RawDevice that was stopped, or -1 if already stopped.
• Rename Device::should_yield() to Device::pending()

Fixed

• Undefined behavior on some architectures (specifically raspberry pi)

[0.2.4] - 2021-02-14

Fixed

• Libraries built on smelling_salts using 100% of CPU unnecessarily

[0.2.3] - 2021-02-06

Fixed

• Not compiling for Android

[0.2.2] - 2021-01-16

Fixed

• Stalling issue (futures no longer waked after non-deterministic event).

[0.2.1] - 2020-12-30

Fixed

• Not compiling dummy implementation.

[0.2.0] - 2020-12-29

Added

• Device::should_yield() for checking if the waker was trying to wake a different task.

[0.1.0] - 2020-05-03

Added

• Device for registering wakers for file descriptors.
• Watcher for constructing event (input or output) list to watch for.

Commits

• 7ca0a7d Merge branch 'main' of github.com:AldaronLau/smelling_salts
• d18fa7d Merge branch 'working'
• 27aa38f Release candidate for 0.3.0
• 0c17977 Simplify Implementation, improve method names in API.
• db611cf Upgrade to GitHub-native Dependabot (#9)
• 5d0ed7d v0.2.4 (from 'working' into main)
• ea76836 v0.2.4 release candidate.
• 9d78d37 Fix taking 100% CPU bug.
• d0e3c00 v0.2.3
• 0d478f7 Patch: Use correct function name for errno on Android.
• Additional commits viewable in compare view

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[dependabot]

Superseded by #53.