Fix nested nullable for 3.1.0 (updated)

marshmallow-code / apispec

A pluggable API specification generator. Currently supports the OpenAPI Specification (f.k.a. the Swagger specification)..

https://apispec.readthedocs.io/

MIT License

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Closed sloria closed 7 months ago

sloria commented 7 months ago

same as #898 with changelog and authors update

closes #898 closes #845 closes #833