Update README.md

README.md

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 SapBERT by [Liu et al. (2020)](https://arxiv.org/pdf/2010.11784.pdf). Please use [CLS] as the representation of the input.
+
+
+```bibtex
+@article{liu2020self,
+  title={Self-alignment Pre-training for Biomedical Entity Representations},
+  author={Liu, Fangyu and Shareghi, Ehsan and Meng, Zaiqiao and Basaldella, Marco and Collier, Nigel},
+  journal={arXiv preprint arXiv:2010.11784},
+  year={2020}
+}
+```