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Implementing Ord for sort operation on Vec<Version>

Hi, thank you for creating this project.

I saw in the source code that PartialOrd is already implemented, thus if Ord is also implemented sorting a vector of Version will become extremely easy.

One use case is:

use semver_rs;

#[cfg(test)]
mod tests {
    use super::*;

    fn vec_compare<T: AsRef<str>>(va: &[T], vb: &[T]) -> bool {
        (va.len() == vb.len()) && va.iter().zip(vb).all(|(a, b)| a.as_ref() == b.as_ref())
    }
    #[test]
    fn test_sort() {
        // Create a vector of semver_rs::Version
        let mut input_versions_list = vec![
            "1.2.3-dev",
            "1.2.3-dev.1",
            "1.2.3-dev.cache",
            "1.2.3",
            "2.0.0",
            "1.1.1",
        ]
        .iter()
        .flat_map(|version| semver_rs::Version::new(version).parse())
        .collect::<Vec<semver_rs::Version>>();
 
        // Sort it inplace
        input_versions_list.sort();

        // Create the expected Vec<&str>
        let output: Vec<String> = input_versions_list
            .iter()
            .map(|x| x.to_string())
            .collect::<Vec<String>>();

       let expected = vec![
            "1.1.1".to_owned(),
            "1.2.3-dev".to_owned(),
            "1.2.3-dev.1".to_owned(),
            "1.2.3-dev.cache".to_owned(),
            "1.2.3".to_owned(),
            "2.0.0".to_owned(),
        ];
        assert!(vec_compare(&output, &expected));
    }
}

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