clean up some new clippy warnings

src/ecc_compact/mod.rs

@@ -4,11 +4,7 @@ use p256::{
     elliptic_curve::{ecdh, sec1::ToCompactEncodedPoint, DecompactPoint},
     FieldBytes,
 };
-use std::{
-    convert::TryFrom,
-    hash::{Hash, Hasher},
-    ops::Deref,
-};
+use std::{hash::Hasher, ops::Deref};
 
 #[derive(Debug, Clone)]
 pub struct PublicKey(pub(crate) p256::PublicKey);

src/ed25519/mod.rs

@@ -1,8 +1,5 @@
 use crate::*;
-use std::{
-    convert::TryFrom,
-    hash::{Hash, Hasher},
-};
+use std::hash::Hasher;
 
 #[derive(Debug, Clone)]
 pub struct PublicKey(pub(crate) ed25519_compact::PublicKey);

src/public_key.rs

@@ -3,7 +3,6 @@
 //! since a client will need to be able to parse and use a public key from any
 //! keypair.
 use crate::*;
-use std::{convert::TryFrom, hash::Hash};
 
 ///Verify a given message against a given signature slice. Public keys are
 ///expected to implemt this trait to verify signed messages.

src/secp256k1/mod.rs

@@ -1,10 +1,7 @@
 use crate::*;
 use base64::{engine::general_purpose::STANDARD, Engine};
 use k256::{ecdsa, elliptic_curve::sec1::ToEncodedPoint};
-use std::{
-    convert::TryFrom,
-    hash::{Hash, Hasher},
-};
+use std::hash::Hasher;
 use thiserror::Error;
 
 #[derive(Debug, Clone)]