CONTRIBUTORS.md: Add Debora Grosse

CONTRIBUTORS.md

@@ -6,6 +6,7 @@ Contributors
 * [Anton Sergeev](https://github.com/anton-sergeev)
 * [Christian Schulze](https://github.com/ChristianSch)
 * [Dave Gamble](https://github.com/DaveGamble)
+* [Debora Grosse](https://github.com/DeboraG)
 * [dieyushi](https://github.com/dieyushi)
 * [Dongwen Huang (黄东文)](https://github.com/DongwenHuang)
 * Eswar Yaganti