Turn on serde support for Value.

[autozimu]

Which makes conversion from/to other types much easier

Also update rmpv to latest release.

[daa84]

Don't understand why serde support make conversion much easier? Currently i use Value::as_* functions, and trait From. Thanks

[autozimu]

WIth with-serde turned on, one can have

#[Deserialize, Serialize]
struct MyStruct {
    foo: String,
    bar: i64,
}

let v = Value;
let s: MyStruct = rmpv::ext::deserialize_from(v).unwrap();

From this point, one can just use s instead of matching and casting.

[daa84]

Looks cool, thanks 👍