Update README.md

README.md

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 ## Reminder
 
-ST-GCN has transferred to MMSkeleton,
+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.
 
-Custom networks, data loaders and checkpoints of old st-gcn are compatible with MMSkeleton.
-We will **stop supporting** this repository soon.
+This code base will soon be not maintained and exists as a historical artifact to supplement our AAAI paper:
 
+> **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).
-If you want to use old ST-GCN, please refer to [OLD_README.md](./OLD_README.md).
+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).