Issue #2231693 by amitgoyal, iS: Update Powered by Drupal link.

core/modules/system/src/Plugin/Block/SystemPoweredByBlock.php

@@ -24,7 +24,7 @@ class SystemPoweredByBlock extends BlockBase {
    * {@inheritdoc}
    */
   public function build() {
-    return array('#markup' => '<span>' . t('Powered by <a href="@poweredby">Drupal</a>', array('@poweredby' => 'http://drupal.org')) . '</span>');
+    return array('#markup' => '<span>' . t('Powered by <a href="@poweredby">Drupal</a>', array('@poweredby' => 'https://drupal.org')) . '</span>');
   }