Update README: Change citation author to UltraData Team

README_ZH.md

@@ -154,7 +154,7 @@ L1 数据虽然格式整洁，但内容质量参差不齐。L2 阶段引入了
 ```bibtex
 @misc{ultradata-math,
   title={UltraData-Math},
-  author={Chuyue Zhou and Hongya Lv and Xinle Lin and Yudong Wang and Jie Zhou and Hengyu Zhao and Junshao Guo and Xueren Zhang and Shuaikang Xue and Zhiyuan Liu},
+  author={UltraData Team},
   year={2026},
   url={https://huggingface.co/datasets/openbmb/UltraData-Math},
   publisher={Hugging Face}