[COMMUNITY] @FrozenGene -> Reviewer (#2544)

* [COMMUNITY] @FrozenGene -> Reviewer

* Fix

CONTRIBUTORS.md

@@ -51,14 +51,15 @@ We do encourage everyone to work anything they are interested in.
 - [Siju Samuel](https://github.com/siju-samuel): @siju-samuel
 - [Junru Shao](https://github.com/junrushao1994): @junrushao1994
 - [Haichen Shen](https://github.com/icemelon9): @icemelon9
+- [Andrew Tulloch](https://github.com/ajtulloch): @ajtulloch
 - [Alex Weaver](https://github.com/alex-weaver): @alex-weaver
 - [Yao Wang](https://github.com/kevinthesun): @kevinthesun
 - [Leyuan Wang](https://github.com/Laurawly): @Laurawly
 - [Jian Weng](https://github.com/were): @were
+- [Zhao Wu](https://github.com/FrozenGene): @FrozenGene
 - [Eddie Yan](https://github.com/eqy): @eqy
 - [Joshua Z. Zhang](https://github.com/zhreshold): @zhreshold
 - [Lianmin Zheng](https://github.com/merrymercy): @merrymercy
-- [Andrew Tulloch](https://github.com/ajtulloch): @ajtulloch
 
 ## List of Contributors
 - [Full List of Contributors](https://github.com/dmlc/tvm/graphs/contributors)