[README] Add GNNLens (#3411)

* Update README.md

* Update README.md

README.md

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 * Graph4NLP: an easy-to-use library for R&D at the intersection of Deep Learning on Graphs and Natural Language Processing. https://github.com/graph4ai/graph4nlp
 * GNN-RecSys: https://github.com/je-dbl/GNN-RecSys
 * Amazon Neptune ML: a new capability of Neptune that uses Graph Neural Networks (GNNs), a machine learning technique purpose-built for graphs, to make easy, fast, and more accurate predictions using graph data. https://aws.amazon.com/cn/neptune/machine-learning/
+* GNNLens2: Visualization tool for Graph Neural Networks. https://github.com/dmlc/GNNLens2
 
 ### Awesome Papers Using DGL
 
@@ -293,6 +294,8 @@ Take the survey [here](https://forms.gle/Ej3jHCocACmb49Gp8) and leave any feedba
 
 1. [**Graph Attention Multi-Layer Perception**](https://github.com/PKU-DAIR/GAMLP/blob/main/GAMLP.pdf), *Wentao Zhang, Ziqi Yin, Zeang Sheng, Wen Ouyang, Xiaosen Li, Yangyu Tao, Zhi Yang, Bin Cui*
 
+1. [**GNNLens: A Visual Analytics Approach for Prediction Error Diagnosis of Graph Neural Networks**](https://arxiv.org/abs/2011.11048v5), *Zhihua Jin, Yong Wang, Qianwen Wang, Yao Ming, Tengfei Ma, Huamin Qu*
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 </details>
 
 ## Contributing