Update app.py

app.py

@@ -22,7 +22,7 @@ def ens2frs(ens):
     frs = []
     for result, duration in results:
         print(f"Result:{result}, Time taken: {duration:.2f} seconds")
-        frs.append[result, duration]
+        frs.append([result, duration])
 
     end_total = time.time()
     duration_total = end_total - start_total