message: fix bert prepare_model.py
diff: @@ -20,7 +20,7 @@ import paddle
  paddle.enable_static()
  model_name = "bert_chinese_L-12_H-768_A-12"
  -module = hub.Module(model_name)
  +module = hub.Module(name=model_name)
  inputs, outputs, program = module.context(
  trainable=True, max_seq_len=int(sys.argv[1]))
  place = fluid.core_avx.CPUPlace()
  