CONTRIBUTORS.md in ghn-2.2.0 vs CONTRIBUTORS.md in ghn-2.3.0

- old
+ new

@@ -3,5 +3,6 @@
 
 * Fujimura Daisuke (@fujimura)
 * Takashi Masuda (@masutaka)
 * @hamaco
 * Syohei YOSHIDA (@syohex)
+* Masatomo Nakano (@masatomo)