Flask-smorest

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Other changes:

- *Backwards-incompatible*: Remove ``_wrapper_class`` from ``Page``. Creating a
custom pager is easier by just overriding ``Page`` methods.
- *Backwards-incompatible*: Let ``OPENAPI_SWAGGER_UI_SUPPORTED_SUBMIT_METHODS``
default to "all methods" list.

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Bug fixes:

- Swagger UI integration: respect ``OPENAPI_SWAGGER_UI_URL`` configuration paramater.
- ``Api.register_field``: use ``APISpec.register_field`` rather than access ``self.spec.ma_plugin`` directly.

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Features:

- *Backwards-incompatible*: Use apispec 0.39.0 plugin class interface.
- *Backwards-incompatible*: Expose APISpec's ``register_field`` and ``register_converter methods`` from ``Api`` object. ``Api.register_converter`` signature is modified to make ``name`` parameter optional.
- Pass extra apispec plugins to internal APISpec instance.

Other changes:

- *Backwards-incompatible*: Drop official support for Python 3.4.

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Features:

- Pass OpenAPI version as ``OPENAPI_VERSION`` app config parameter.
- Add Swagger UI (3.x) integration.

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Features:

- ReDoc: Use unpkg CDN for 2.x version.

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Features:

- *Backwards-incompatible*: In ``Blueprint.route``, the endpoint name defaults to the function name with the case unchanged. Before this change, the name was lowercased.
- *Backwards-incompatible*: Pagination is now managed by dedicated ``Blueprint.paginate`` decorator.
- Add ``etag.INCLUDE_HEADERS`` to specify which headers to use for ETag computation (defaults to ``['X-Pagination']``).
- In ``verify_check_etag``, endpoint name is added to the warning message.