Update README.md

README.md

 # yolov7
 
-Implementation of paper - [YOLOv7: Trainable bag-of-freebies sets new state-of-the-art for real-time object detectors]()
+Implementation of paper - [YOLOv7: Trainable bag-of-freebies sets new state-of-the-art for real-time object detectors](https://arxiv.org/abs/2207.02696)
 
 <img src="./figure/performance.png" height="480">
 
@@ -78,7 +78,7 @@ The training code and instrument will release soon.
 @article{wang2022yolov7,
   title={{YOLOv7}: Trainable bag-of-freebies sets new state-of-the-art for real-time object detectors},
   author={Wang, Chien-Yao and Bochkovskiy, Alexey and Liao, Hong-Yuan Mark},
-  journal={arXiv preprint},
+  journal={arXiv preprint arXiv:2207.02696},
   year={2022}
 }
 ```