custom slider added

src/pdfchatbot.py

@@ -180,7 +180,7 @@ class PDFChatBot:
         self.chat_history.append((query, result["answer"]))
         for char in result['answer']:
             history[-1][-1] += char
-        return result['answer'], " "
+        return history, " "
 
     def render_file(self, file,chunk_size):
         """