Update README.md

Author: csxmli2016

README.md

@@ -34,7 +34,7 @@ The first row is real low quality image(close-up in right bottom is the guided i
 
 # Requirements and Dependencies
 
-- Torch
+- [Torch](https://github.com/torch/distro)
 - [Cuda](https://developer.nvidia.com/cuda-toolkit-archive)-8.0
 - [stn](https://github.com/qassemoquab/stnbhwd)