Fix clippy warnings (#236)

src/events/data.rs

@@ -1,5 +1,5 @@
 use super::*;
-use std::{cmp::Ordering, time::Duration};
+use std::cmp::Ordering;
 
 /// Internal representation of an event, as handled by the audio context.
 pub struct EventData {

src/events/store.rs

@@ -3,10 +3,7 @@ use crate::{
     constants::*,
     tracks::{ReadyState, TrackHandle, TrackState},
 };
-use std::{
-    collections::{BinaryHeap, HashMap},
-    time::Duration,
-};
+use std::collections::{BinaryHeap, HashMap};
 use tracing::info;
 
 #[derive(Debug, Default)]