added image generation tool to the list of available tools

app.py

@@ -79,7 +79,8 @@ with open("prompts.yaml", 'r') as stream:
     
 agent = CodeAgent(
     model=model,
-    tools=[final_answer, get_current_time_in_timezone, get_amazing_dog_fact], ## add your tools here (don't remove final answer)
+    tools=[final_answer, get_current_time_in_timezone, get_amazing_dog_fact,
+          image_generation_tool], ## add your tools here (don't remove final answer)
     max_steps=6,
     verbosity_level=1,
     grammar=None,