Add Bert Service statistic for hub serving (#362)

* add bs stat

* fix ci

paddlehub/commands/serving.py

@@ -172,6 +172,9 @@ class ServingCommand(BaseCommand):
         from paddle_gpu_serving.run import BertServer
         bs = BertServer(with_gpu=args.use_gpu)
         bs.with_model(model_name=args.modules[0])
+        CacheUpdater(
+            "hub_bert_service", module=args.modules[0],
+            version="0.0.0").start()
         bs.run(gpu_index=args.gpu, port=int(args.port))
 
     @staticmethod