feat: implement Default trait for SipAddr struct

Author: shenjinti

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rsipstack"
-version = "0.2.29"
+version = "0.2.30"
 edition = "2021"
 description = "SIP Stack Rust library for building SIP applications"
 license = "MIT"

src/transport/sip_addr.rs

@@ -59,7 +59,7 @@ use std::{fmt, hash::Hash, net::SocketAddr};
 /// * `SocketAddr` (for IP addresses only)
 /// * `rsip::Uri` (SIP URI format)
 /// * `rsip::HostWithPort` (host/port only)
-#[derive(Debug, Eq, PartialEq, Clone)]
+#[derive(Debug, Eq, PartialEq, Clone, Default)]
 pub struct SipAddr {
     pub r#type: Option<rsip::transport::Transport>,
     pub addr: HostWithPort,