Update idna to 2.8

[pyup-bot]

This PR updates idna from 2.7 to 2.8.

Changelog

2.8

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

- Update to Unicode 11.0.0.
- Provide more specific exceptions for some malformed labels.

Links

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

[codecov]

Codecov Report

Merging #164 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #164   +/-   ##
=======================================
  Coverage   71.86%   71.86%           
=======================================
  Files           6        6           
  Lines         455      455           
  Branches       25       25           
=======================================
  Hits          327      327           
  Misses        117      117           
  Partials       11       11

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