Tae/Humphrey

Results 3 comments of Tae/Humphrey

@alexanderjordanbaker I think it would be better if we can replace it. In this PR, I added v2 for compatibility. Do you think that I should make it replace it...

PS: I just found [this thread](https://github.com/apple/app-store-server-library-python/pull/6), but still the question is unanswered. If it is okay, want to change the models into dataclass and stuffs.

Sorry for the late reply. The reason why I thought it would be better to use dataclass or pydantic instead of attrs is : 1) simplicity - attrs needs users...