Update to Drupal 8.1.2. For more information, see https://www.drupal.org/project/drupal/releases/8.1.2

core/lib/Drupal/Core/Archiver/ArchiverInterface.php

@@ -56,4 +56,5 @@ interface ArchiverInterface {
    *   An array of file names relative to the root of the archive.
    */
   public function listContents();
+
 }

core/lib/Drupal/Core/Archiver/Tar.php

@@ -87,4 +87,5 @@ class Tar implements ArchiverInterface {
   public function getArchive() {
     return $this->tar;
   }
+
 }

core/lib/Drupal/Core/Archiver/Zip.php

@@ -89,4 +89,5 @@ class Zip implements ArchiverInterface {
   public function getArchive() {
     return $this->zip;
   }
+
 }