Controller override issue Magento 2

I am trying to override customer/account/editpost controller.

I am getting error

Recoverable Error: Argument 1 passed to Magento\Customer\Controller\Account\EditPost::__construct() must be an instance of Magento\Framework\App\Action\Context

I created di.xml file at location module/etc/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

   <preference for="Magento\Customer\Controller\Account\EditPost" 
     type="Namespace\Modulename\Controller\Index\Editpost" />
</config>

and controller Controller\Index\Editpost.php

namespace Namespace\Modulename\Controller\Index;

class Editpost extends \Magento\Customer\Controller\Account\EditPost
{

    public function execute()
    {

        echo "asdasdsda"; die;
        return parent::execute();
    }


}