Scheduled weekly dependency update for week 39

[pyup-bot]

Update fonttools from 4.14.0 to 4.15.0.

Changelog

4.15.0

----------------------------

- [plistlib] Added typing annotations to plistlib module. Set up mypy static
typechecker to run automatically on CI (2061).
- [ttLib] Implement private ``Debg`` table, a reverse-DNS namespaced JSON dict.
- [feaLib] Optionally add an entry into the ``Debg`` table with the original
lookup name (if any), feature name / script / language combination (if any),
and original source filename and line location. Annotate the ttx output for
a lookup with the information from the Debg table (2052).
- [sfnt] Disabled checksum checking by default in ``SFNTReader`` (2058).
- [Docs] Document ``mtiLib`` module (2027).
- [varLib.interpolatable] Added checks for contour node count and operation type
of each node (2054).
- [ttLib] Added API to register custom table packer/unpacker classes (2055).

Links

• PyPI: https://pypi.org/project/fonttools
• Changelog: https://pyup.io/changelogs/fonttools/
• Repo: http://github.com/fonttools/fonttools

[pyup-bot]

Closing this in favor of #313