don't expect/panic crash whole bot on malformed json

src/main.rs

@@ -117,9 +117,10 @@ impl UpdateBot {
                 o: 1,
                 d: resp_message,
             };
-            let response_json =
+            match serde_json::to_string(&response) {
-                serde_json::to_string(&response).expect("Error parsing json response");
+                OK(response_json) => cwtch.send_message(&profile.handle, convo_id, &response_json),
-            cwtch.send_message(&profile.handle, convo_id, &response_json);
+                Err(e) => println!("Error parsing json response: {}", e.to_string()),
+            }
         }
     }
 }