Library does not recognize accented characters

[lamkr]

Describe the bug
Library does not recognize accented characters in file openapi.json, field 'tags'. With the below example, the class file generated contains name "CartoNico", and not "CartaoUnico"

To Reproduce
File example (partial):
{ "openapi": "3.0.0", "info": { "title": "bla bla API", "version": "1.0", ... }, "tags": [ { "name": "Cartão único", "description": "....." } ] }

Expected behavior
It must generates source with character not accented.

Desktop (please complete the following information):

• OS: any

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