Add traits to SampleFormat's #[derive(...)] invocation (#864)

Specifically, `PartialOrd`, `Ord`, & `Hash`.

src/samples_formats.rs

@@ -6,7 +6,7 @@ pub use dasp_sample::{FromSample, Sample, I24, I48, U24, U48};
 
 /// Format that each sample has.
 #[cfg_attr(target_os = "emscripten", wasm_bindgen)]
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
 #[non_exhaustive]
 pub enum SampleFormat {
     /// `i8` with a valid range of 'u8::MIN..=u8::MAX' with `0` being the origin