Log Message:
py-fonttools: updated to 4.21.1

4.21.1 (released 2021-02-26)

[pens] Reverted breaking change that turned AbstractPen and AbstractPointPen \ 
into abstract base classes.

4.21.0 (released 2021-02-26)

[feaLib] Indent anchor statements in asFea() to make them more legible and diff-able.
[pens] Turn AbstractPen and AbstractPointPen into abstract base classes.
[feaLib] Added support for parsing and building STAT table from AFDKO feature files.
[instancer] Added option to update name table of generated instance using STAT \ 
table's axis values.
[bezierTools] Added functions to compute bezier point-at-time, as well as \ 
line-line, curve-line and curve-curve intersections.

4.20.0 (released 2021-02-15)

[COLRv1] Added unbuildColrV1 to deconstruct COLRv1 otTables to raw json-able \ 
data structure; it does the reverse of buildColrV1.
[feaLib] Allow sub X by NULL sequence to delete a glyph.
[arrayTools] Fixed Vector division.
[COLRv1] Define new PaintSweepGradient.
[otTables] Moved Paint.Format enum class outside of Paint class definition, now \ 
named PaintFormat. It was clashing with paint instance Format attribute and thus \ 
was breaking lazy load of COLR table which relies on magic __getattr__.
[COLRv1] Replace hand-coded builder functions with otData-driven dynamic \ 
implementation.
[COLRv1] Define additional static (non-variable) Paint formats.
[subset] Added support for subsetting COLR v1 and CPAL tables.
[fontBuilder] Allow setupFvar to optionally take designspaceLib.AxisDescriptor \ 
objects. Added new setupAvar method. Support localised names for axes and named \ 
instances.

4.19.1 (released 2021-01-28)

[woff2] An initial off-curve point with an overlap flag now stays an off-curve \ 
point after compression.

4.19.0 (released 2021-01-25)

[codecs] Handle errors parameter different from 'strict' for the custom extended \ 
mac encodings.
[featureVars] Raise better error message when a script is missing the required \ 
default language system.
[COLRv1] Avoid abrupt change caused by rounding PaintRadialGradient.c0 when the \ 
start circle almost touches the end circle's perimeter.
[COLRv1] Support building unlimited lists of paints as 255-ary trees of \ 
PaintColrLayers tables.
[subset] Prune redundant format-12 cmap subtables when all non-BMP characters \ 
are dropped.
[basePen] Raise MissingComponentError instead of bare KeyError when a referenced \ 
component is missing