More.cerberus

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- Nothing changed yet.

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- **Removed**: Removed support for Python 2.

You have to upgrade to Python 3 if you want to use this version.

- Added support for Python 3.7 and 3.8 and PyPy 3.6.

- Make Python 3.7 the default testing environment.

- Upgrade Cerberus to version 1.3.2.

- Add integration for the Black code formatter.

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- Add Python 3.6 support.
- Add example for creating a custom error view to README.
- Some smaller fixes.

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- initial public release.