InvoicePrinter 2.1 with Ruby 3 support

Ruby 3 was released three months ago, so it was a time to support it in InvoicePrinter, a pure Ruby library for generating PDF invoices.InvoicePrinter 2.1 dependencies were upgraded to Prawn 2.4 and Ruby 3 by following the separation of positional and keyword arguments. If you pass a hash to InvoicePrinter::Document or InvoicePrinter::Document::Item, you now need to use double splat in front of it:.