Update README.md

Author: ChenLiu-1996

README.md

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     <b>ImmunoStruct</b>: A multimodal neural network framework for immunogenicity prediction from peptide-MHC sequence, structure, and biochemical properties
-    <a href="https://www.biorxiv.org/content/10.1101/2024.11.01.621580"><strong>Explore the paper »</strong></a>
+    &nbsp&nbsp&nbsp<a href="https://www.biorxiv.org/content/10.1101/2024.11.01.621580"><strong>Explore the paper »</strong></a>
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   </p>
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