Update citation tittles

Author: ZeyuChen

README.md

@@ -328,12 +328,13 @@ PaddleNLP提供了多粒度、多场景的NLP应用示例，面向动态图模
 如果PaddleNLP对您的研究有帮助，欢迎引用
 ```
 @misc{=paddlenlp,
-    title={An Easy-to-use and High Performance NLP Library based on PaddlePaddle},
+    title={PaddleNLP: An Easy-to-use and High Performance NLP Library},
     author={PaddleNLP Contributors},
     howpublished = {\url{https://github.com/PaddlePaddle/PaddleNLP}},
     year={2021}
 }
 ```
+
 ## Acknowledge
 
 我们借鉴了Hugging Face的[Transformers](https://github.com/huggingface/transformers)🤗关于预训练模型使用的优秀设计，在此对Hugging Face作者及其开源社区表示感谢。

README_en.md

@@ -227,7 +227,7 @@ For more details about our release, please refer to [ChangeLog](./docs/changelog
 If you find PaddleNLP useful in your research, please consider cite
 ```
 @misc{=paddlenlp,
-    title={An Easy-to-use and High Performance NLP Library based on PaddlePaddle},
+    title={PaddleNLP: An Easy-to-use and High Performance NLP Library},
     author={PaddleNLP Contributors},
     howpublished = {\url{https://github.com/PaddlePaddle/PaddleNLP}},
     year={2021}