Update CONTRIBUTORS.md (#2719)

dmlc · Sep 17, 2017 · 1190dc6 · 1190dc6
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diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
@@ -17,6 +17,10 @@ Committers are people who have made substantial contribution to the project and
   - Micheal is a lawyer, data scientist in France, he is the creator of xgboost interactive analysis module in R.
 * [Yuan Tang](https://github.com/terrytangyuan)
   - Yuan is a data scientist in Chicago, US. He contributed mostly in R and Python packages.
+* [Nan Zhu](https://github.com/CodingCat)
+  - Nan is a software engineer in Microsoft. He contributed mostly in JVM packages.
+* [Sergei Lebedev](https://github.com/superbobry)
+  - Serget is a software engineer in Criteo. He contributed mostly in JVM packages.
 
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