add @komuW to CONTRIBUTORS.txt

CONTRIBUTORS.txt

@@ -207,3 +207,4 @@ David Harrigan, 2016/02/01
 Ahmet Demir, 2016/02/27
 Maxime Verger, 2016/02/29
 Alexander Oblovatniy, 2016/03/10
+Komu Wairagu, 2016/04/