Update idna to 3.1

[pyup-bot]

This PR updates idna from 2.10 to 3.1.

Changelog

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

3.0

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

- Python 2 is no longer supported (the 2.x branch supports Python 2,
use "idna<3" in your requirements file if you need Python 2 support)
- Support for V2 UTS 46 test vectors.

Links

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

[codecov-io]

Codecov Report

Merging #66 (309c7ab) into master (dc3318f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #66   +/-   ##
=======================================
  Coverage   99.14%   99.14%           
=======================================
  Files          12       12           
  Lines         117      117           
=======================================
  Hits          116      116           
  Misses          1        1           

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[pyup-bot]

Closing this in favor of #95