breaking-attr 0.1.3

An attribute macro that enforces per-version invariants on items.
Documentation 
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An attribute macro to enforce per-version invariants on items.

```rust
use breaking_attr::breaking;

#[test]
fn hash_impl_did_not_change() {
    #[breaking(sha2 = "zEk8F98i1LX-Rr070lCztGerzO1-qlLbosetY1UvSww=")]
    const SEED: &str = "This value must not change between minor versions.";

    #[breaking("3zIKlGMq-shMmThdYSOntWhl9QCx3A23i8tnEfNPWBY=")] // defaults to `blake3`
    const HASH: u64 = 5201689092505688044;
    
    // Just for example:
    let mut hasher = std::hash::DefaultHasher::new();
    hasher.write(SEED.as_bytes());
    debug_assert_eq!(hasher.finish(), HASH);
}
```