Update rodio to 0.17.1 and cpal to 0.15.1

[shatteringlass]

Solves #745

[eladyn]

Thank you for the suggestion! Unfortunately, updating that dependency isn't as easy as updating Cargo.lock.

➜ cargo tree --invert=rodio --all-features
rodio v0.13.1
└── librespot-playback v0.2.0
    ├── librespot-connect v0.2.0
    │   └── spotifyd v0.3.4 (/home/user/spotifyd)
    └── spotifyd v0.3.4 (/home/user/spotifyd)

As you can see, we pull in the dependency only indirectly through librespot-playback. And even on the current dev version, their Cargo.toml requires the older rodio version.

(Compiling your version with --locked fails with: error: the lock file /home/user/spotifyd/Cargo.lock needs to be updated but --locked was passed to prevent this.)

So what should instead be done is making a PR to librespot that updates their Cargo.toml and fixes the potential compilation errors that arise from this. :)

[shatteringlass]

Very sorry about the issue, I'm not expert with Rust at all and I shouldn't have messed up with Cargo :)
But because I'd like to help solve the issue I have opened this PR on librespot and hopefully it works this time.

[eladyn]

Sure, no worries! Regarding your changes to librespot, you'll need to upgrade jack to “0.5” as well, since otherwise there are dependency conflicts on the jack-sys crate between jack and cpal. But otherwise, I think you could submit that PR. :)