Update app.py

Fix return type of tool

app.py

@@ -10,7 +10,7 @@ from Gradio_UI import GradioUI
 
 # Below is an example of a tool that does nothing. Amaze us with your creativity !
 @tool
-def my_json_compare(json1:str, json2:int)-> str: #it's import to specify the return type
+def my_json_compare(json1:str, json2:int)-> bool: #it's import to specify the return type
     #Keep this format for the description / args / args description but feel free to modify the tool
     """A tool that compares two given jsons
     Args: