Update idna to 3.2

[pyup-bot]

This PR updates idna from 3.0 to 3.2.

Changelog

3.2

++++++++++++++++

- Add type hints (Thanks, Seth Michael Larson!)
- Remove support for Python 3.4

3.1

++++++++++++++++

- Ensure license is included in package (Thanks, Julien Schueller)
- No longer mark wheel has universal (Thanks, Matthieu Darbois)
- Test on PowerPC using Travis CI

Links

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

[pyup-bot]

Closing this in favor of #114