Enum compatibility with serde

[alsam]

Hello, the issue is quite similar to Compatibility with serde, but for enum:

#[derive_ReprC]
#[repr(u8)]
#[derive(Serialize, Deserialize, Debug, Clone)]
#[allow(non_camel_case_types)]
pub enum Type {
    reg,
    mem,
    // see issue [Compatibility with serde](https://github.com/getditto/safer_ffi/issues/35)
    #[serde(rename = "clear-excl")]
    clear_excl,
    stop,
}

as you have fixed it for struct could you please do the same for enum?
Thanks!