This is how the collection view should be updated

The way I was doing it before was resulting in reused views getting
updated by the code, which caused albums to appear in the wrong place.

Persephone/DataSources/AlbumDataSource.swift

@@ -27,7 +27,7 @@ class AlbumDataSource: NSObject, NSCollectionViewDataSource {
         self.albums[indexPath.item].coverArt = image
 
         DispatchQueue.main.async {
-          albumViewItem.setAlbum(self.albums[indexPath.item])
+          collectionView.reloadItems(at: [indexPath])
         }
       }
     }