Update idna to 3.1

[pyup-bot]

This PR updates idna from 3.0 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

Links

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

[codecov]

Codecov Report

Merging #64 (1cd142e) into master (3e0fa41) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #64   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines          123       123           
=========================================
  Hits           123       123           

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[pyup-bot]

Closing this in favor of #94