Update app.py

app.py

@@ -53,7 +53,7 @@ image_generation_tool = load_tool("agents-course/text-to-image", trust_remote_co
 with open("prompts.yaml", 'r') as stream:
     prompt_templates = yaml.safe_load(stream)
 
-def say_hello(name: str) -> str
+def say_hello(name: str) -> str:
     """Say hello to someone.
     Args:
         name: the person's name