Fixing clippy issues (#418)

src/errors.rs

@@ -87,7 +87,8 @@ pub enum ProtocolError<T = Infallible> {
     InvalidLoginError,
     /// Error with serializing / deserializing protocol messages
     SerializationError,
-    /// Invalid length for `name`: expected `len`, but is actually `actual_len`.
+    /** Invalid length for `{name}`: expected {len}, actual {actual_len} */
+    #[allow(clippy::doc_markdown, unused_assignments)]
     SizeError {
         /// name
         name: &'static str,

src/key_exchange/mod.rs

@@ -243,6 +243,7 @@ where
     serde(bound = "")
 )]
 #[derive(Clone, Debug, Eq, Hash, PartialEq, Zeroize)]
+#[allow(unused_assignments)]
 pub struct SerializedContext<'a> {
     length: GenericArray<u8, U2>,
     #[zeroize(skip)]