Merge pull request thunlp#9 from pencoa/master

Add one paper for Heterogeneous Graph

README.md

@@ -163,6 +163,9 @@ Contributed by Jie Zhou, Ganqu Cui and Zhengyan Zhang.
 1. **Can GCNs Go as Deep as CNNs?.**
 *Guohao Li, Matthias Müller, Ali Thabet, Bernard Ghanem.* 2019. [paper](https://arxiv.org/pdf/1904.03751.pdf)
 
+1. **Heterogeneous Graph Attention Network**
+*Xiao Wang, Houye Ji, Chuan Shi, Bai Wang, Peng Cui, P. Yu, Yanfang Ye* WWW2019. [paper](https://arxiv.org/pdf/1903.07293.pdf)
+
 ### Applications
 
 1. **Discovering objects and their relations from entangled scene representations.**