[Paper List] Add Three Papers (#2525)

* Update README.md

* Update README.md

* Update README.md

README.md

@@ -281,6 +281,12 @@ We are currently in Beta stage.  More features and improvements are coming.
 
 1. [**Learning Robust Node Representations on Graphs**](https://arxiv.org/abs/2008.11416), *Xu Chen, Ya Zhang, Ivor Tsang, Yuangang Pan*
 
+1. [**Adaptive Graph Diffusion Networks with Hop-wise Attention**](https://arxiv.org/abs/2012.15024), *Chuxiong Sun, Guoshi Wu*
+
+1. [**The Photoswitch Dataset: A Molecular Machine Learning Benchmark for the Advancement of Synthetic Chemistry**](https://arxiv.org/abs/2008.03226), *Aditya R. Thawani, Ryan-Rhys Griffiths, Arian Jamasb, Anthony Bourached, Penelope Jones, William McCorkindale, Alexander A. Aldrick, Alpha A. Lee*
+
+1. [**A community-powered search of machine learning strategy space to find NMR property prediction models**](https://arxiv.org/abs/2008.05994), *Lars A. Bratholm, Will Gerrard, Brandon Anderson, Shaojie Bai, Sunghwan Choi, Lam Dang, Pavel Hanchar, Addison Howard, Guillaume Huard, Sanghoon Kim, Zico Kolter, Risi Kondor, Mordechai Kornbluth, Youhan Lee, Youngsoo Lee, Jonathan P. Mailoa, Thanh Tu Nguyen, Milos Popovic, Goran Rakocevic, Walter Reade, Wonho Song, Luka Stojanovic, Erik H. Thiede, Nebojsa Tijanic, Andres Torrubia, Devin Willmott, Craig P. Butts, David R. Glowacki, Kaggle participants*
+
 </details>
 
 ## Installation