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- Drop Python 2.7 support because it reached its end-of-life.
- Add support for examples defined in schema.
- Add support for 'anyOf' during example generation based on schema.
- Fix loading $ref in other YAML files.
- Fix freeforom (property-less) obhect schema rendering.
- Respect RFC7807 in example generation.
- Add new experimental OpenAPI v3 renderer.