py-fonttools: updated to 3.34.0

3.34.0:
- [varLib] Support generation of CFF2 variable fonts. model.reorderMasters()
  now supports arbitrary mapping. Fix handling of overlapping ranges for feature
  variations.
- [cffLib, subset] Code clean-up and fixing related to CFF2 support.
- [ttLib.tables.ttProgram] Use raw strings for regex patterns.
- [fontbuilder] Initial support for building CFF2 fonts. Set CFF's
  FontMatrix automatically from unitsPerEm.
- [plistLib] Accept the more general collections.Mapping instead of the
  specific dict class to support custom data classes that should serialize
  to dictionaries.

(adam)