add KEY for zachgk

CONTRIBUTORS.md

@@ -69,6 +69,8 @@ The committers are the granted write access to the project.
   - Patric is a parallel computing expert and a major contributor to the MXNet MKL-DNN backend.
 * [Tao Lv](https://github.com/TaoLv)
   - Tao is a major contributor to the MXNet MKL-DNN backend and performance on CPU.
+* [Zach Kimberg](https://github.com/zachgk)
+  - Zach is one of the major maintainers of the MXNet Scala package.
 
 
 ### Become a Committer
@@ -238,7 +240,6 @@ List of Contributors
 * [Zhiyuan Huang](https://github.com/huangzhiyuan)
 * [Zak Jost](https://github.com/zjost)
 * [Shoubhik Bhattacharya](https://github.com/shoubhik)
-* [Zach Kimberg](https://github.com/zachgk)
 * [Rohit Srivastava](https://github.com/access2rohit)
 
 Label Bot

KEYS

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 =dQvb
+
+-----END PGP PUBLIC KEY BLOCK-----
+pub   rsa4096 2019-05-15 [SC]
+      228ADD932CB218723E61D09E043071126325F0EC
+uid           [ultimate] Zach Kimberg <[email protected]>
+sig 3        043071126325F0EC 2019-05-15  Zach Kimberg <[email protected]>
+sub   rsa4096 2019-05-15 [E]
+sig          043071126325F0EC 2019-05-15  Zach Kimberg <[email protected]>
+
+-----BEGIN PGP PUBLIC KEY BLOCK-----
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