Update idna to 2.8 (#1402)
Update idna to 2.8 (#1402)

This PR updates [idna](https://pypi.org/project/idna) from **2.7** to **2.8**.



<details>
  <summary>Changelog</summary>
  
  
   ### 2.8
   ```
   ++++++++++++++++

- Update to Unicode 11.0.0.
- Provide more specific exceptions for some malformed labels.
   ```
   
  
</details>


 

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/idna
  - Changelog: https://pyup.io/changelogs/idna/
  - Repo: https://github.com/kjd/idna
</details>


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