breaks in PHP8 due to money_format()

[PxT]

php-pdf-invoice/src/Invoice.php

Line 704 in 3d82348

return '$' . money_format('%.2n', $fPrice);

money_format() was deprecated in PHP 7.4 and removed in 8.0
https://www.php.net/manual/en/function.money-format.php

[PxT]

Pull request #7