Update README.md

README.md

@@ -52,7 +52,7 @@ image.save("flux-dev.png")
 
 ```
 @article{Pref-GRPO&UniGenBench,
-  title={Pref-GRPO: Pairwise Preference Reward-based GRPO for Stable Text-to-Image Reinforcement Learning.},
+  title={Pref-GRPO: Pairwise Preference Reward-based GRPO for Stable Text-to-Image Reinforcement Learning},
   author={Wang, Yibin and Li, Zhimin and Zang, Yuhang and Zhou, Yujie and Bu, Jiazi and Wang, Chunyu and Lu, Qinglin, and Jin, Cheng and Wang, Jiaqi},
   journal={arXiv preprint arXiv:2508.20751},
   year={2025}