Update bert-base card

README.md

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 # Logion base model
 
-BERT-based model pretrained on largest set of pre-modern Greek to-date (70+ million words). It was introduced in this [paper](https://aclanthology.org/2023.alp-1.20/). This model ignores cases and accents/diacritics.
+BERT-based model pretrained on largest set of pre-modern Greek to-date. It was introduced in this [paper](https://aclanthology.org/2023.alp-1.20/).
+
+The model uses a WordPiece tokenizer (vocab size of 50,000) on a corpus of over 70 million words (over 95 million tokens) of premodern Greek. This model ignores cases and accents/diacritics.
 
 ## How to use