min/max fields are not always applied

[sadeli413]

On initialization, the min or max derives do not necessarily work. They don't work on mutation either, which is a related but separate issue.

use lain::prelude::*;
use lain::rand;

#[derive(Debug, Mutatable, NewFuzzed, BinarySerialize)]
struct MyStruct {
    #[lain(min = 5, max = 7)]
    field_1: u32,

    #[lain(min = 5, max = 7)]
    field_2: Vec<u8>,
}

fn main() {
    // Min/max does not necessarily work on initialization
    for _ in 0..1000 {
        let mut mutator = Mutator::new(rand::thread_rng());
        let instance = MyStruct::new_fuzzed(&mut mutator, None);

        assert!((5..7).contains(&instance.field_1), "Got invalid field_1 value {}", instance.field_1);
        assert!((5..7).contains(&instance.field_2.len()), "Got invalid field_2 length {}", instance.field_2.len());
    }
}

    Finished release [optimized] target(s) in 0.22s
     Running `target/release/tmp_vendor`
thread 'main' panicked at src/main.rs:20:9:
Got invalid field_1 value 3141465631
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace