update tokenizer config file

tokenizer_config.json

@@ -1 +1 @@
-{"do_lower_case": true, "max_len": 512}
+{"unk_token": "<unk>", "add_prefix_space": false, "errors": "replace", "sep_token": "</s>", "cls_token": "<s>", "pad_token": "<pad>", "mask_token": "<mask>", "model_max_length": 512, "do_lower_case": true, "name_or_path": "bert-base-uncased"}