PHP 7.2+ support [mcrypt removed]

[lubos-h]

Hello, please would you add support for PHP 7.2+ ?

the createHash function uses mcrypt which is removed since PHP 7.2
https://www.php.net/manual/en/function.mcrypt-module-open.php

public function createHash($string)
{
    $key = pack('H*', $this->getKey());
    $string = substr(sha1($string), 0, 32);
    $cipher = **mcrypt_module_open**(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
    $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($cipher), MCRYPT_DEV_URANDOM);

    mcrypt_generic_init($cipher, $key, $iv);
    $sign = mcrypt_generic($cipher, pack('H*', $string));
    mcrypt_generic_deinit($cipher);

    return strtoupper(bin2hex($sign));
}