Fixed missing imports in PyPDF2

- Removed by autoflake8 pre-commit plugin
- Now PyPDF2 is excluded, but a pre-commit run did it

kibot/PyPDF2/__init__.py

@@ -1,2 +1,5 @@
+from .pdf import PdfFileReader, PdfFileWriter
 from .merger import PdfFileMerger
+from .pagerange import PageRange, parse_filename_page_ranges
+from ._version import __version__
 __all__ = ["pdf", "PdfFileMerger"]