Update README.md

Author: layumi

leaderboard/README.md

@@ -7,13 +7,15 @@ Priorities are given to papers whose codes are published.
 
  * [Supervised Learning](#supervised-learning)
  * [Transfer Learning](#transfer-learning)
+
 
- ### Code
+ ## Code
 
  :red_car:  The 1st Place Submission to AICity Challenge 2020 re-id track [[code]](https://github.com/layumi/AICIty-reID-2020)
  [[paper]](https://github.com/layumi/AICIty-reID-2020/blob/master/paper.pdf)
 
  :helicopter:  Drone-based building re-id [[code]](https://github.com/layumi/University1652-Baseline)  [[paper]](https://arxiv.org/abs/2002.12186)
+
 
  ## Supervised Learning