Bader Nasser

It would be nice to be able to extract some pages from a PDF using a file that looks like this: ```txt 6 # from 2 to 4 2-4 #from...

Make some of the optional flags required

3

**Is your feature request related to a problem? Please describe.** I have many optional flags, but I want at least one of these to be required. https://github.com/bader-nasser/pdftools#pdftools-extract: ```bash pdftools extract...