console/migrations/m160222_160058_add_user_info_email.php

<?php

use yii\db\Migration;

class m160222_160058_add_user_info_email extends Migration
{
    public function up()
    {
        $this->addColumn('{{%user_info}}', 'email', $this->string());
    }

    public function down()
    {
        $this->dropColumn('{{%user_info}}', 'email');
    }
}