Update config.json

config.json

@@ -17,7 +17,7 @@
   "intermediate_size": 3072,
   "max_position_embeddings": 512,
   "num_attention_heads": 12,
-  "num_hidden_layers": 1,
+  "num_hidden_layers": 4,
   "pre_trained": "",
   "structure": [],
   "type_vocab_size": 2