display time elapsed when download images

arkindex_worker/image.py

@@ -102,7 +102,9 @@ def download_image(url):
     # Preprocess the image and prepare it for classification
     image = Image.open(BytesIO(resp.content))
     logger.info(
-        "Downloaded image {} - size={}x{}".format(url, image.size[0], image.size[1])
+        "Downloaded image {} - size={}x{} in {}".format(
+            url, image.size[0], image.size[1], resp.elapsed
+        )
     )
 
     return image