Update README.md

README.md

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 - **vocab: 152,537개**(기존 bert 모델 vocab(119,548개)에 32,989개 vocab 추가)
 
 ## Usage (HuggingFace Transformers)
+- 평균 폴링(mean_pooling) 방식 사용. ([cls 폴링](https://huggingface.co/sentence-transformers/bert-base-nli-cls-token), [max 폴링](https://huggingface.co/sentence-transformers/bert-base-nli-max-tokens))
 
 ```python
 from transformers import AutoTokenizer, AutoModel