Version 0.2.3

• Added support for subsetting variable fonts by instancing them
  • This is feature-flagged behind the variable-fonts feature, which is now enabled by default
  • A new API subset_with_variations was added to specify the variation coordinates
• Subsetting now preserves more name table records (7, 8, 9, 11, 12, 13, 14 from the spec)
• Bumped the kurbo dependency to version 0.12
• Added MSRV of Rust 1.82