Update app.py

app.py

@@ -13,7 +13,7 @@ from google.protobuf import descriptor
 from google.protobuf import descriptor_pool
 from google.protobuf import symbol_database
 from google.protobuf.compiler import plugin_pb2
-from google.protobuf.json_format import MessageToDic
+from google.protobuf.json_format import MessageToDict
 
 # 加载环境变量
 load_dotenv()