signature: revome PrehashSignature (#1924)

Closes #1917.

Author: carloskiki

signature/CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `std` feature - replaced with `core::error::Error`
 - `derive` feature
 - `SignerMut` blanket implementation for `Signer`
+- `PrehashSignature` trait
 
 [#1448]: https://github.com/RustCrypto/traits/pull/1448
 [#1759]: https://github.com/RustCrypto/traits/pull/1759

signature/src/lib.rs

@@ -141,12 +141,9 @@ mod signer;
 mod verifier;
 
 #[cfg(feature = "digest")]
-mod prehash_signature;
+pub use digest;
 
 pub use crate::{encoding::*, error::*, keypair::*, signer::*, verifier::*};
 
-#[cfg(feature = "digest")]
-pub use {crate::prehash_signature::*, digest};
-
 #[cfg(feature = "rand_core")]
 pub use rand_core;