use_dataclasses.md

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Add use_dataclasses config setting

Instead of using the attrs package in the generated code, you can choose to use the built-in dataclasses module by setting use_dataclasses: true in your config file. This may be useful if you are trying to reduce external dependencies, or if your client package might be used in applications that require different versions of attrs.

The generated client code should behave exactly the same from an application's point of view except for the following differences:

• The generated project file does not have an attrs dependency.
• If you were using attrs.evolve to create an updated instance of a model class, you should use dataclasses.replace instead.
• Undocumented attributes of the Client class that had an underscore prefix in their names are no longer available.
• The builder methods with_cookies, with_headers, and with_timeout do not modify any Httpx client that may have been created from the previous Client instance; they affect only the new instance.