Update to latest PyPDF2

[MartinThoma]

I've just noticed that pdftools exists and is used via StackOverflow :-)

You might want to update it to the latest version of PyPDF2 soon, as we are going to deprecate a lot of methods / classes. If you want, I can help you to move.

It might also be interesting to to move pdftools to the https://github.com/py-pdf organization. There might also be some overlap in project goals with pdfly, but pdftools is more mature.

[MartinThoma]

I've just released a new version pypdf (without the "2"). I hope that the community can switch back again to pypdf:-)