[Readme] Update Awesome Papers Using DGL (#2400)

Add GraphHINGE paper (Conference Version (KDD'20) and Journal Version) in Awesome Papers Using DGL.
Co-authored-by: Quan (Andy) Gan <coin2028@hotmail.com>

README.md

@@ -212,6 +212,10 @@ We are currently in Beta stage.  More features and improvements are coming.
 
 1. [**FusedMM: A Unified SDDMM-SpMM Kernel for Graph Embedding and Graph Neural Networks**](https://arxiv.org/pdf/2011.06391.pdf), *Md. Khaledur Rahman, Majedul Haque Sujon, , Ariful Azad*
 
+1. [**An Efficient Neighborhood-based Interaction Model for Recommendation on Heterogeneous Graph**](https://arxiv.org/pdf/2007.00216.pdf), KDD'20 *Jiarui Jin, Jiarui Qin, Yuchen Fang, Kounianhua Du, Weinan Zhang, Yong Yu, Zheng Zhang, Alexander J. Smola*
+
+1. [**Learning Interaction Models of Structured Neighborhood on Heterogeneous Information Network**](https://arxiv.org/pdf/2011.12683.pdf), *Jiarui Jin, Kounianhua Du, Weinan Zhang, Jiarui Qin, Yuchen Fang, Yong Yu, Zheng Zhang, Alexander J. Smola*
+
 1. [**Graphein - a Python Library for Geometric Deep Learning and Network Analysis on Protein Structures**](https://www.biorxiv.org/content/10.1101/2020.07.15.204701v1), *Arian R. Jamasb, Pietro Lió, Tom L. Blundell*
 
 1. [**Graph Policy Gradients for Large Scale Robot Control**](https://arxiv.org/abs/1907.03822), *Arbaaz Khan, Ekaterina Tolstaya, Alejandro Ribeiro, Vijay Kumar*