Update app.py

app.py

@@ -37,7 +37,7 @@ temas_para_links = {
 llm = ChatOpenAI(
     model="deepseek/deepseek-r1:free", 
     temperature=0.4,
-    openai_api_key=os.environ.get("OPENROUTER_API_KEY"),
+    openai_api_key=os.getenv("OPENROUTER_API_KEY"),
     openai_api_base="https://openrouter.ai/api/v1"
 )
 memoria = ConversationBufferMemory(memory_key="chat_history", return_messages=True, output_key="answer")