Update website url

Author: Xiao9905

README.md

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-   <a href="https://twitter.com/thukeg" target="_blank">🐦 Twitter</a> | <a href="mailto:agentbench@googlegroups.com">✉️ Google Group</a> | <a href="https://arxiv.org/abs/2308.03688" target="_blank">📃 Paper </a>
+   <a href="https://docs.google.com/spreadsheets/d/e/2PACX-1vRR3Wl7wsCgHpwUw1_eUXW_fptAPLL3FkhnW_rua0O1Ji_GIVrpTjY5LaKAhwO-WeARjnY_KNw0SYNJ/pubhtml" target="_blank">🌐 Leaderboard (new)</a> | <a href="https://twitter.com/thukeg" target="_blank">🐦 Twitter</a> | <a href="mailto:agentbench@googlegroups.com">✉️ Google Group</a> | <a href="https://arxiv.org/abs/2308.03688" target="_blank">📃 Paper </a>
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