Log Message:
py-fonttools: updated to 4.28.5

4.28.5 (released 2021-12-19)
----------------------------
- [svgPathPen] Continuation of 2471: make sure all occurrences of ``str()`` are now
  replaced with user-defined ``ntos`` callable.
- [merge] Refactored code into submodules, plus several bugfixes and improvements:
  fixed duplicate-glyph-resolution GSUB-lookup generation code; use tolerance in \ 
glyph
  comparison for empty glyph's width; ignore space of default ignorable glyphs;
  downgrade duplicates-resolution missing-GSUB from assert to warn; added \ 
--drop-tables
  option.