Add a note regarding the Buffer lifetime

src/buffer.rs

@@ -11,6 +11,9 @@ use std::simd::{LaneCount, Simd, SupportedLaneCount};
 /// inputs already copied to the outputs. You can either use the iterator adapters to conveniently
 /// and efficiently iterate over the samples, or you can do your own thing using the raw audio
 /// buffers.
+///
+/// TODO: This lifetime makes zero sense because you're going to need unsafe lifetime casts to use
+///       this either way. Maybe just get rid of it in favor for raw pointers.
 #[derive(Default)]
 pub struct Buffer<'a> {
     /// Contains slices for the plugin's outputs. You can't directly create a nested slice form