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diff --git a/vendor/psy/psysh/src/Psy/VersionUpdater/Checker.php b/vendor/psy/psysh/src/Psy/VersionUpdater/Checker.php
new file mode 100644
index 000000000..7d6b29472
--- /dev/null
+++ b/vendor/psy/psysh/src/Psy/VersionUpdater/Checker.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2017 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\VersionUpdater;
+
+interface Checker
+{
+    const ALWAYS = 'always';
+    const DAILY = 'daily';
+    const WEEKLY = 'weekly';
+    const MONTHLY = 'monthly';
+    const NEVER = 'never';
+
+    /**
+     * @return bool
+     */
+    public function isLatest();
+
+    /**
+     * @return string
+     */
+    public function getLatest();
+}