Update twilight support to twilight 0.11 (#132)

* update twilight support to twilight 0.11

* rustfmt

src/manager.rs

@@ -105,11 +105,7 @@ impl Songbird {
     {
         Self {
             client_data: PRwLock::new(ClientData {
-                shard_count: cluster
-                    .config()
-                    .shard_scheme()
-                    .total()
-                    .unwrap_or_else(|| cluster.shards().len() as u64),
+                shard_count: cluster.config().shard_scheme().total(),
                 initialised: true,
                 user_id: user_id.into(),
             }),

src/tracks/error.rs

@@ -24,8 +24,9 @@ impl fmt::Display for TrackError {
         write!(f, "failed to operate on track (handle): ")?;
         match self {
             TrackError::Finished => write!(f, "track ended"),
-            TrackError::InvalidTrackEvent =>
-                write!(f, "given event listener can't be fired on a track"),
+            TrackError::InvalidTrackEvent => {
+                write!(f, "given event listener can't be fired on a track")
+            },
             TrackError::SeekUnsupported => write!(f, "track did not support seeking"),
         }
     }