[docs] fix examples in README

Author: capcom6

README.md

@@ -156,7 +156,7 @@ async function sendSMS() {
         // Check status after 5 seconds
         setTimeout(async () => {
             const updatedState = await jwtClient.getState(state.id);
-            console.log('Message status:', updatedState.status);
+            console.log('Message status:', updatedState.state);
         }, 5000);
     } catch (error) {
         console.error('Sending failed:', error);