Using the script changes the PDF version from 1.5 to 1.3

I tried to use the script to change the page labels. This works perfectly but manages to change the PDF version rendering the final version incompatible with a lot of archives. edit: On digging further, I believe this is a problem with the pdfwriter python module. https://github.com/pmaupin/pdfrw/blob/master/pdfrw/pdfwriter.py It can only handle writing PDF 1.3. Perhaps a warning can be placed in the readme.