Update app.py

app.py

@@ -34,7 +34,7 @@ def get_current_time_in_timezone(timezone: str) -> str:
         return f"Error fetching time for timezone '{timezone}': {str(e)}"
 
 @tool
-def exchange(base="GBP":str, target="EUR":str, amount:float)-> float: #it's import to specify the return type
+def exchange(base:str, target:str, amount:float)-> float: #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 calculates currency exchange rates.
     Args: