remove unneeded .as_ref() calls

src/hashes/blake512.rs

@@ -17,7 +17,7 @@ impl Hasher for BLAKE512 {
     }
 
     fn digest(&mut self, bytes: impl AsRef<[u8]>) {
-        self.hasher.update(bytes.as_ref())
+        self.hasher.update(bytes)
     }
 
     fn complete(mut self) -> HashReturn {

src/hashes/md5.rs

@@ -15,7 +15,7 @@ impl Hasher for MD5 {
     }
 
     fn digest(&mut self, bytes: impl AsRef<[u8]>) {
-        self.hasher.update(bytes.as_ref())
+        self.hasher.update(bytes)
     }
 
     fn complete(mut self) -> HashReturn {

src/hashes/sha1.rs

@@ -15,7 +15,7 @@ impl Hasher for SHA1 {
     }
 
     fn digest(&mut self, bytes: impl AsRef<[u8]>) {
-        self.hasher.update(bytes.as_ref())
+        self.hasher.update(bytes)
     }
 
     fn complete(mut self) -> HashReturn {