fix uncalled closure

Author: michaelhenry

Sources/ImageViewer_swift/ImageCarouselViewController.swift

@@ -1,6 +1,6 @@
 import UIKit
 
-public protocol ImageDataSource:class {
+public protocol ImageDataSource: AnyObject {
     func numberOfImages() -> Int
     func imageItem(at index:Int) -> ImageItem
 }

Sources/ImageViewer_swift/ImageLoader.swift

@@ -23,6 +23,7 @@ public struct URLSessionImageLoader: ImageLoader {
 
             DispatchQueue.main.async {
                 imageView.image = image
+                completion(image)
             }
         }
     }