correct changes documentation 

upload v1.19.3 

Merge branch 'master' of https://github.com/rk700/PyMuPDF

Update symbols.txt 

Update README.md 

hotfixing pymupdf#1266

Merge branch 'master' of https://github.com/rk700/PyMuPDF

improve test scripts `show_pdf_page` and `insert_image` are now tested with rotated insertions.

upload v1.18.16 

update documentation to v1.18.15