update prompt

app.py

@@ -999,7 +999,7 @@ When it is necessary to use tools and you must use the following format to outpu
 Thought: you should always think about what to do and consider previous and subsequent steps
 Action:
 ```
-{"action": $TOOL_NAME,'action_input': "the input to the action"}
+{{'action': $TOOL_NAME,'action_input': "the input to the action"}}
 ```
 Observation: the result of the action.
 
@@ -1011,7 +1011,7 @@ If **Thought**, **Action** is missing in the response of using tools, you must r
 Thought: I know what to respond
 Action:
 ```
-{"action": "Final Answer", "action_input": "Final response to human"}
+{{'action': "Final Answer", 'action_input': "Final response to human"}}
 ```
 
 If **Thought**, **Action** is missing in the response of using tools, you must re-write the response.