Fixed a warning in the demo project

Examples/SDWebImage Demo/MasterViewController.m

@@ -372,7 +372,7 @@
         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
     }
 
-    cell.textLabel.text = [NSString stringWithFormat:@"Image #%d", indexPath.row];
+    cell.textLabel.text = [NSString stringWithFormat:@"Image #%ld", (long)indexPath.row];
     cell.imageView.contentMode = UIViewContentModeScaleAspectFill;
     [cell.imageView setImageWithURL:[NSURL URLWithString:[_objects objectAtIndex:indexPath.row]]
                    placeholderImage:[UIImage imageNamed:@"placeholder"] options:indexPath.row == 0 ? SDWebImageRefreshCached : 0];