Update README.md

README.md

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 ### AbLang model for heavy chains
 
-This is a huggingface version of AbLang: A language model for antibodies. It was introduced in
+This is a 🤗 version of AbLang: A language model for antibodies. It was introduced in
 [this paper](https://doi.org/10.1101/2022.01.20.477061) and first released in
 [this repository](https://github.com/oxpig/AbLang). This model is trained on uppercase amino acids: it only works with capital letter amino acids.