v2.0.5

• Use ufoLib2 instead of defcon to load UFOs (#599).
• MutatorMath is now optional. Only required if you use --use-mutatormath option.
• Bumped minimum requirements:
  • fonttools >= 4.1.0
  • glyphsLib >= 5.1.0
  • ufo2ft >= 2.9.2
  • booleanOperations >= 0.9.0
  • ufoLib2 >= 0.5.0