Update app.py

app.py

@@ -164,7 +164,7 @@ class ChatbotAPP:
                 .
                 .                
                 
-                                    ""","10 minutes has been elapsed. Barry died due to not getting treatment!"))
+                                    ""","10 minutes have been elapsed. Barry died due to not getting treatment!"))
                 return temp_history
         
             self.context += """