Log Message:
py-fonttools: updated to 4.28.4

4.28.4 (released 2021-12-15)
----------------------------

- [merge] Merge GDEF marksets in Lookups properly
- [feaLib] Have ``fontTools feaLib`` script exit with error code when build fails
- [svgPathPen] Added ``ntos`` option to customize number formatting (e.g. rounding)
- [subset] Speed up subsetting of large CFF fonts
- [otTables] Speculatively promote lookups to extension to speed up compilation. \ 
If the
  offset to lookup N is too big to fit in a ushort, the offset to lookup N+1 is \ 
going to
  be too big as well, so we promote to extension all lookups from lookup N onwards

4.28.3 (released 2021-12-03)
----------------------------

- [subset] Fixed bug while subsetting ``COLR`` table, whereby incomplete layer \ 
records
  pointing to missing glyphs were being retained leading to ``struct.error`` upon
  compiling. Make it so that ``glyf`` glyph closure, which follows the ``COLR`` glyph
  closure, does not influence the ``COLR`` table subsetting
- [docs] Fully document the ``cmap`` and ``glyf`` tables
- [colorLib.unbuilder] Fixed CLI by deleting no longer existing parameter \ 
(180bb1867).

4.28.2 (released 2021-11-22)
----------------------------

- [otlLib] Remove duplicates when building coverage
- [docs] Add interrogate configuration
- [docs] Remove comment about missing “start” optional argument to \ 
``calcChecksum``
- [cu2qu/cli] Adapt to the latest ufoLib2.
- [subset] Support subsetting SVG table and remove it from the list of  drop by \ 
default tables
- [subset] add ``--pretty-svg`` option to pretty print SVG table contents
- [merge] Support merging ``CFF`` tables (CID-keyed ``CFF`` is still not supported)
- [merge] Support ``--output-file``
- [docs] Split table docs into individual pages
- [feaLib] Forbid empty classes
- [docs] Improve documentation for ``fontTools.ttLib.ttFont``