Bump ascii from 0.9.2 to 0.9.3 in /services/sensor_tracker

[dependabot[bot]]

Bumps ascii from 0.9.2 to 0.9.3.

Changelog

Sourced from ascii's changelog.

Version 0.9.3 (2019-08-26)

Soundness fix:

Remove unsound impls of From<&mut AsciiStr> for &mut [u8] and &mut str. This is a breaking change, but theese impls can lead to undefined behavior in safe code.

If you use this impl and know that non-ASCII values are never inserted into the [u8] or str, you can pin ascii to 0.9.2.

Other changes:

• Make quickcheck Arbitrary impl sometimes produce AsciiChar::DEL.
• Implement Clone, Copy and Eq for ToAsciiCharError.
• Implement ToAsciiChar for u16, u32 and i8.

Commits

• a0dde1f Version 0.9.3
• 7df0dce Mention CString & CStr as #![no_std] difference in README
• dc7e073 Remove unsound trait impls
• 828f954 Implement ToAsciiChar for i8, u16 and u32
• 1d6793b Implement Clone, Copy and Eq for ToAsciiCharError
• 509c167 Test optional dependencies on Travis
• 8db4597 Remove no_std docs link
• efb6e59 Fix quickcheck Arbitrary impl never generating DEL
• See full diff in compare view

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