Update app.py

app.py

@@ -9,7 +9,7 @@ from Gradio_UI import GradioUI
 
 # Below is an example of a tool that does nothing. Amaze us with your creativity !
 @tool
-def population(arg1:str)-> str: #it's import to specify the return type
+def population(country_name:str)-> str: #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 does get the most recent number of habitants of a specific country. 
     Args: