Update README.md

Author: kangben258

tools/eval/README.md

@@ -23,7 +23,7 @@ Supported datasets:
 - [IIIT5K](#iiit5k)
 - [Mini Supervisely](#mini-supervisely)
 - [OTB](#otb)
-- 
+  
 ## ImageNet
 
 ### Prepare data
@@ -220,7 +220,7 @@ The script is modified based on  [PyTracking](https://github.com/visionml/pytrac
 
 ### Prepare data
 
-Please download the mini_supervisely data from [here]() which includes the validation dataset and unzip it.. Organize files as follow:
+Please download the mini_supervisely data from [here](https://drive.google.com/drive/folders/1DZvtlnG9U94cgLD6Yi3eU7r6QZJkjdl-?usp=sharing) which includes the validation dataset and the json file, then unzip it. Organize files as follow:
 
 ```shell
 $ tree -L 2 /path/to/otb