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

vendor/sebastian/global-state/README.md

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+# GlobalState
+
+Snapshotting of global state, factored out of PHPUnit into a stand-alone component.
+
+## Installation
+
+To add this package as a local, per-project dependency to your project, simply add a dependency on `sebastian/global-state` to your project's `composer.json` file. Here is a minimal example of a `composer.json` file that just defines a dependency on GlobalState:
+
+    {
+        "require": {
+            "sebastian/global-state": "1.0.*"
+        }
+    }