Update link to latest v3 beta

README.md

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     <p><b>CharGen</b> is a project aiming to make AI able to generate characters for roleplay that don't suck.</p>
     <p>Notable models:
       <a href="https://huggingface.co/CharGen/CharGen-v3-mini" target="_blank">CharGen v3 mini</a>,
-      <a href="https://huggingface.co/CharGen/CharGen-v3-beta-rl-55-s48" target="_blank">CharGen v3 beta</a>,
+      <a href="https://huggingface.co/CharGen/CharGen-v3-beta-rl-83-s0" target="_blank">CharGen v3 beta</a>,
       <a href="https://huggingface.co/kubernetes-bad/chargen-v2" target="_blank">CharGen v2</a></p>
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