extend 1.2.0

Create extensions for types you don't own with extension traits but without the boilerplate.
Documentation 
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mod a {
    use extend::ext;

    #[ext]
    pub impl i32 {
        fn foo() -> Foo { Foo }
    }

    pub struct Foo;
}

fn main() {
    use a::i32Ext;
    i32::foo();
}