feat: Derive PartialEq for some structs

- CoapRequest
- CoapResponse
- Packet
- Header

Closes #41.

src/header.rs

@@ -253,7 +253,7 @@ pub enum MessageType {
 }
 
 /// The message header.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq)]
 pub struct Header {
     ver_type_tkl: u8,
     pub code: MessageClass,

src/packet.rs

@@ -348,7 +348,7 @@ impl From<ObserveOption> for usize {
 }
 
 /// The CoAP packet.
-#[derive(Debug, Clone, Default)]
+#[derive(Debug, Clone, Default, PartialEq)]
 pub struct Packet {
     pub header: Header,
     token: Vec<u8>,

src/request.rs

@@ -14,7 +14,7 @@ use crate::{
 };
 
 /// The CoAP request.
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, PartialEq)]
 pub struct CoapRequest<Endpoint> {
     pub message: Packet,
     pub response: Option<CoapResponse>,

src/response.rs

@@ -4,7 +4,7 @@ use crate::{
 };
 
 /// The CoAP response.
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, PartialEq)]
 pub struct CoapResponse {
     pub message: Packet,
 }