Update idna to 3.0

[pyup-bot]

This PR updates idna from 2.8 to 3.0.

Changelog

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.

2.10

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

- Update to Unicode 13.0.0.
- Throws a more specific exception if "xn--" is provided as a label.
- This is expected to be the last version that supports Python 2.

2.9

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

- Update to Unicode 12.1.0.
- Prohibit A-labels ending with a hyphen (Thanks, Julien Bernard!)
- Future-proofing: Test on Python 3.7 and 3.8, don't immediately
fail should Python 4 come along.
- Made BSD 3-clause license clearer

Links

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

[codecov-io]

Codecov Report

Merging #53 (20ae0ba) into master (203f8eb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #53   +/-   ##
=======================================
  Coverage   82.05%   82.05%           
=======================================
  Files           2        2           
  Lines          39       39           
=======================================
  Hits           32       32           
  Misses          7        7           

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[pyup-bot]

Closing this in favor of #54