move Da\User migrations from resources to dedicated namespace

lib/User/Migration/m000000_000004_create_token_table.php

@@ -0,0 +1,29 @@
+<?php
+namespace Da\User\Migration;
+
+use yii\db\Migration;
+
+class m000000_000004_create_token_table extends Migration
+{
+    public function up()
+    {
+        $this->createTable(
+            '{{%token}}',
+            [
+                'user_id' => $this->integer(),
+                'code' => $this->string(32)->notNull(),
+                'type' => $this->smallInteger(6)->notNull(),
+                'created_at' => $this->integer()->notNull()
+            ]
+        );
+
+        $this->createIndex('idx_token_user_id_code_type', '{{%token}}', ['user_id', 'code', 'type'], true);
+
+        $this->addForeignKey('fk_token_user', '{{%token}}', 'user_id', '{{%user}}', 'id', 'CASCADE', 'RESTRICT');
+    }
+
+    public function down()
+    {
+        $this->dropTable('{{%token}}');
+    }
+}