Update README.md

README.md

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 ST-GCN has transferred to [MMSkeleton](https://github.com/open-mmlab/mmskeleton),
 and keep on developing as an flexible open source toolbox for skeleton-based human understanding.
+You are welcome to migrate to new MMSkeleton.
+Custom networks, data loaders and checkpoints of old st-gcn are compatible with MMSkeleton.
+If you want to use old ST-GCN, please refer to [OLD_README.md](./OLD_README.md).
 
 This code base will soon be not maintained and exists as a historical artifact to supplement our AAAI papers on:
-
 > **Spatial Temporal Graph Convolutional Networks for Skeleton-Based Action Recognition**, Sijie Yan, Yuanjun Xiong and Dahua Lin, AAAI 2018. [[Arxiv Preprint]](https://arxiv.org/abs/1801.07455)
-  
 For more recent works please checkout MMSkeleton.
 
-You are welcome to migrate to new 
-[MMSkeleton](https://github.com/open-mmlab/mmskeleton).
-Custom networks, data loaders and checkpoints of old st-gcn are compatible with MMSkeleton.
-If you want to use old ST-GCN, please refer to [OLD_README.md](./OLD_README.md).