Update app.py

app.py

@@ -71,7 +71,7 @@ def get_current_time_in_timezone(timezone: str) -> str:
 
 
 @tool
-def generate_image(description: str) -> Image:
+def generate_image(description: str) -> str:
     """A tool that generates an image from a text description.
     Args:
         description: A string representing the text description to generate an image of.