Update README.md

README.md

@@ -31,6 +31,7 @@ Under the ModelScope framework, the current model can be used by calling a simpl
 ```
 GIT_LFS_SKIP_SMUDGE=1 git clone https://github.com/modelscope/modelscope  && cd modelscope && pip install -e . && cd ../ 
 pip install open_clip_torch
+pip install pytorch-lightning
 ```
 
 ### Code example (Demo Code)