Update the design diagram
Update the design diagram

Distrotech/libpwd,Distrotech/librevenge,Distrotech/libpwd,Distrotech/libpwd,cpjreynolds/libwpd,Distrotech/librevenge,Distrotech/librevenge,Distrotech/librevenge,Distrotech/libpwd,cpjreynolds/libwpd,Distrotech/librevenge,cpjreynolds/libwpd