Reverted to calling PdfFileWriter.getReference() since it has been re-implemented in pdf.py
Reverted to calling PdfFileWriter.getReference() since it has been re-implemented in pdf.py

KumaranKamalanathan/PyPDF2,dellelce/ypypdf2,melsior/PyPDF2,manuelzs/PyPDF2,vfulco/PyPDF2,vfulco/PyPDF2,magnet-cl/PyPDF2,melsior/PyPDF2,magnet-cl/PyPDF2,dellelce/ypypdf2,KumaranKamalanathan/PyPDF2,manuelzs/PyPDF2