Update app.py

app.py

@@ -4,7 +4,7 @@ import json
 import os
 
 API_URL = "https://api-inference.huggingface.co/models/mistralai/Mistral-7B-Instruct-v0.3"
-API_KEY = os.getenv("API_KEY")
+API_KEY = os.environ.get("API_KEY")
 HEADERS = {"Authorization": f"Bearer {API_KEY}"}
 
 st.set_page_config(page_title="Mistral Chatbot", layout="centered")