Password expiration feature #102

It's still missing an enforcement which redirects all actions to profile
update until the password is changed

src/User/Migration/m000000_000007_enable_password_expiration.php

@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the 2amigos/yii2-usuario project.
+ *
+ * (c) 2amigOS! <http://2amigos.us/>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Da\User\Migration;
+
+use yii\db\Migration;
+
+class m000000_000007_enable_password_expiration extends Migration
+{
+    public function safeUp()
+    {
+        $this->addColumn('{{%user}}', 'last_password_change', $this->timestamp()->null());
+    }
+
+    public function safeDown()
+    {
+        $this->dropColumn('{{%user}}', 'last_password_change');
+    }
+}