Update README.md

Replaced link to arxiv paper with link to published paper

README.md

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-Code for <a href="https://arxiv.org/abs/2404.11735" target="_blank">"Learning with 3D rotations, a hitchhiker’s guide to SO(3)"</a></h4>
+Code for <a href="https://proceedings.mlr.press/v235/geist24a.html" target="_blank">"Learning with 3D rotations, a hitchhiker’s guide to SO(3)"</a></h4>
 <h6 align="center">A. René Geist, Jonas Frey, Mikel Zhobro, Anna Levina, and Georg Martius</h6>
 
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