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I'm trying to develop my first module,  it should detect when an user processes more than 200$ of orders and generate a voucher.

I was checking if the hook was being called but it's not. What am i doing wrong? Here's the code:

<?php
if (!defined('_PS_VERSION_'))
  exit;

class BlockPromo extends Module {
  public function __construct() {
    $this->name = 'blockpromo';
    $this->tab = 'front_office_features';
    $this->version = '1.0.0';
    $this->author = 'Alessandro Gessa';
    $this->need_instance = 0;
    $this->ps_versions_compliancy = array('min' => '1.6', 'max' => _PS_VERSION_);
    $this->bootstrap = true;

    parent::__construct();

    $this->displayName = $this->l('Block Promo');
    $this->description = $this->l('Permette l\'inserimento di una promozione specifica.');

    $this->confirmUninstall = $this->l('Are you sure you want to uninstall?');

    if (!Configuration::get('MYMODULE_NAME'))
      $this->warning = $this->l('No name provided');
  }

  public function install()
    {
        if (parent::install() == false)
        {
            return false;
        }
        $this->registerHook('actionOrderStatusPostUpdate');
        return true;
    }

  public function hookActionOrderStatusPostUpdate($params) {
    $id_order = $params['order']->id;
    $status = $params['orderStatus']->id;

    $result = $id_order.' - '.$status;

    file_put_contents('./modules/blockpromo/results.txt', $result, LOCK_EX);
    $this->errors[] = Tools::displayError("Your error");
 }
}