change MsgHandlerError

examples/smartsend_example.rs

@@ -1,7 +1,6 @@
 use msghandler::{smartsend, Payload, SmartsendOptions};
 
-#[tokio::main]
-async fn main() {
+fn main() {
     // Create mixed payload data
     let payloads = vec![
         (
@@ -33,7 +32,7 @@ async fn main() {
         ..Default::default()
     };
 
-    match smartsend("/agent/wine/api/v1/prompt", &payloads, &options).await {
+    match smartsend("/agent/wine/api/v1/prompt", &payloads, &options) {
         Ok((envelope, json_str)) => {
             println!("=== Envelope Created ===");
             println!("Correlation ID: {}", envelope.correlation_id);