Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/phpunit/php-file-iterator/README.md

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+# File_Iterator
+
+## Installation
+
+To add File_Iterator as a local, per-project dependency to your project, simply add a dependency on `phpunit/php-file-iterator` to your project's `composer.json` file. Here is a minimal example of a `composer.json` file that just defines a dependency on File_Iterator 1.4:
+
+    {
+        "require": {
+            "phpunit/php-file-iterator": "~1.4"
+        }
+    }
+