Fixed twitter link

vendor/sebastian/global-state/tests/_fixture/SnapshotFunctions.php

@@ -0,0 +1,15 @@
+<?php
+/*
+ * This file is part of the GlobalState package.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SebastianBergmann\GlobalState\TestFixture;
+
+function snapshotFunction()
+{
+}