Update fon requirement from 0.5 to 0.6

[dependabot[bot]]

Updates the requirements on fon to permit the latest version.

Changelog

Sourced from fon's changelog.

[0.6.0] - 2022-01-29

Added

• Support for no-std!
• chan::Ch24, a 24-bit integer channel
• chan::Channel::to_f32()
• pos module containing types for type-safe channel indexing on Frame
• Audio::as_u8_slice()
• Audio::silence() to silence the entire audio buffer
• AudioSink public type returned from Audio::sink()
• Audio::with_u8_buffer()
• Audio::with_audio()
• From<Audio> for both boxed primitive samples and Vec<Frame>
• Frame::new()
• Frame::pan()
• Frame::gain()
• SinkTo struct for converting audio while streaming
• Sink::len()
• Sink::sink_with()
• Sink::is_empty()

Changed

• Renamed Audio::as_slice() to Audio::as_mut_slice(), and Audio::as_slice() now returns an immutable slice
• Frame is now a struct (rather than a trait), and makes use of const generics
• Rename Frame::convert() to Frame::to()
• Merged Stream trait and Resampler struct into a new Stream struct
• Changed Audio back to being backed by a Box<[Frame]>
• Sink is now object-safe
• Sample rates are now represented as NonZeroU32

Removed

• chan::Ch8 because 8-bit audio is uncommon today and you can use Ch16 for 8-bit audio as well as 12-bit audio.
• Audio::with_i8_buffer()
• chan::Channel::to_f64() and chan::Channel::from_f64()
• Audio::with_frame(); Use Audio::with_frames(hz, vec![_; len]) instead
• Audio::with_stream(); Use Audio::with_audio() or Audio::sink() instead
• Audio as IntoIterator; Use Audio::iter() instead.
• Frame::from_f64()
• Frame::from_channel()
• Frame::from_channels()
• Frame::from_mono()
• Sink::buffer()
• Sink::resampler()
• Sink::flush()
• Sink::stream()

Fixed

• Resampler now does proper resampling

... (truncated)

Commits

• 0da249a Update changelog.
• 9d728ae Fix documentation
• a71d84a Format code
• 2373ad1 Add SinkTo and naïve benchmarks.
• caff78a Remove Audio::new() since it's useless now.
• db0c557 Update changelog
• a67fca9 Update logo and icon for docs.
• 008c093 Update links.
• 1969564 Clean up, set official msrv.
• 640ad27 Update copyright year.
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like fon is up-to-date now, so this is no longer needed.