sort-macro 0.2.1

Sort macro input tokens
Documentation 
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Sort macro input tokens

Example
-------------------------------------------------------------------------------
After sorting, it is easy to input keys in an unordered manner
```rust
macro_rules! foo {
    (@branch (a $a:literal) (b $b:literal)) => {
        concat!(stringify!($a), stringify!($b))
    };
    ($($name:ident : $val:literal)+) => {
        sort_macro::sort_in!([.0] {@branch} foo!($( ($name $val) )+))
    };
}
fn main() {
    assert_eq!(foo!(b:3 a:2), "23");
    assert_eq!(foo!(a:2 b:3), "23");
}
```

Grammar
-------------------------------------------------------------------------------
Sort in last group, sort key is `TokenTree::to_string`

```abnf
input  = [key] [prefix] *tt group
prefix = "{" *tt "}"
key    = "[" *tt "]"
```

The key grammar reference: https://github.com/A4-Tacks/tt-path-rs