Update app.py

app.py

@@ -21,7 +21,7 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
 
 
 @tool
-def wikipedia_search(query: str, sentences : int =2):
+def wikipedia_search(query: str, sentences : int =2) -> str:
     """A tool that searches a definition on Wikipedia  
     Args:
         query: the query to fetch the defitniion for on Wikipedia