Update README.md

zeyiwen · web-flow · commit d4d30dab0b7a · 2018-07-17T11:29:11.000+08:00
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+### Upgrade
+We are upgrading this library, and plan to push the code to GitHub in Sep 2018. Stay tuned!
+
+### Related paper
+* Zeyi Wen, Bingsheng He, Kotagiri Ramamohanarao, Shengliang Lu, and Jiashuai Shi. Efficient Gradient Boosted Decision Tree Training on GPUs. The 32nd IEEE International Parallel and Distributed Processing Symposium (IPDPS), pages 234-243, 2018.
 
