v2.1.2

Update dependencies:

• fonttools >= 4.9.0
  https://github.com/fonttools/fonttools/releases/tag/4.7.0
  https://github.com/fonttools/fonttools/releases/tag/4.8.0
  https://github.com/fonttools/fonttools/releases/tag/4.8.1
  https://github.com/fonttools/fonttools/releases/tag/4.9.0

• glyphsLib >= 5.1.10
  https://github.com/googlefonts/glyphsLib/releases/tag/v5.1.8
  https://github.com/googlefonts/glyphsLib/releases/tag/v5.1.9
  https://github.com/googlefonts/glyphsLib/releases/tag/v5.1.10

• ufoLib2 >= 0.7.1
  https://github.com/fonttools/ufoLib2/releases/tag/v0.7.0
  https://github.com/fonttools/ufoLib2/releases/tag/v0.7.1