rename_all is ignored

[remi-dupre]

Hello!

I'll try to take some time to fix this, but I open an issue in case I don't make time for it!

Given the following enum definition :

#[gen_stub_pyclass_enum]
#[pyclass(ord, eq, frozen, hash, str, rename_all = "UPPERCASE")]
#[derive(Hash, PartialOrd, Ord, PartialEq, Eq)]
pub enum State {
    Open,
    Closed,
    Unknown,
}

The output stub looks like this :

class State(Enum):
    Open = auto()
    Closed = auto()
    Unknown = auto()

However, because of the rename_all = "UPPERCASE" the actual enum variants are OPEN, CLOSED and UNKNOWN.