Update app.py

app.py

@@ -7,7 +7,7 @@ from dotenv import load_dotenv
 load_dotenv()
 
 # Retrieve the API key from environment variables
-api_key = os.getenv("Claude_api_key")
+api_key = os.getenv("claude_api_key")
 
 # Initialize the Anthropic client with the API key
 client = anthropic.Anthropic(api_key=api_key)