Update README.md

official/vision/beta/projects/yolo/README.md

@@ -3,7 +3,7 @@
 [![Paper](http://img.shields.io/badge/Paper-arXiv.1804.02767-B3181B?logo=arXiv)](https://arxiv.org/abs/1804.02767)
 [![Paper](http://img.shields.io/badge/Paper-arXiv.2004.10934-B3181B?logo=arXiv)](https://arxiv.org/abs/2004.10934)
 
-This repository is the unofficial implementation of the following paper. However, we spent painstaking hours ensuring that every aspect that we constructed was the exact same as the original paper and the original repository.
+This repository is the unofficial implementation of the following papers. However, we spent painstaking hours ensuring that every aspect that we constructed was the exact same as the original paper and the original repository.
 
 * YOLOv3: An Incremental Improvement: [YOLOv3: An Incremental Improvement](https://arxiv.org/abs/1804.02767)