derive-ctor 0.2.0

Adds `#[derive(ctor)]` which allows for the auto-generation of a constructor.
Documentation 
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use derive_ctor::ctor;

#[derive(ctor, Debug, PartialEq)]
struct StructDefault {
    provided: String,
    #[ctor(default)]
    generated: u32
}

#[derive(ctor, Debug, PartialEq)]
struct StructManyDefault {
    provided: String,
    #[ctor(default)]
    generated1: u32,
    #[ctor(default)]
    generated2: String
}

#[test]
fn test_struct_with_default_field() {
    let test = StructDefault::new(String::from("ABC"));
    assert_eq!(StructDefault { provided: String::from("ABC"), generated: Default::default() }, test);
}

#[test]
fn test_struct_with_multiple_default_fields() {
    let test = StructManyDefault::new(String::from("ABC"));
    assert_eq!(StructManyDefault { provided: String::from("ABC"), generated1: Default::default(), generated2: Default::default() }, test);
}