fix lac demo

python/examples/lac/benchmark.py

@@ -16,7 +16,7 @@
 import sys
 import time
 import requests
-from paddle_serving_app.reader import LACReader
+from lac_reader import LACReader
 from paddle_serving_client import Client
 from paddle_serving_client.utils import MultiThreadRunner
 from paddle_serving_client.utils import benchmark_args

python/examples/lac/lac_client.py

@@ -15,7 +15,7 @@
 # pylint: disable=doc-string-missing
 
 from paddle_serving_client import Client
-from paddle_serving_app.reader import LACReader
+from lac_reader import LACReader
 import sys
 import os
 import io