Update config.json

config.json

@@ -17,5 +17,6 @@
   "num_hidden_layers": 12,
   "pad_token_id": 1,
   "type_vocab_size": 1,
-  "vocab_size": 23292
+  "vocab_size": 23292,
+  "tokenizer_class": "BertTokenizer"
 }