Merge pull request #3004 from wyc/patch-1

Update CONTRIBUTORS.txt

CONTRIBUTORS.txt

@@ -201,3 +201,4 @@ Dave Smith, 2015/10/27
 Dennis Brakhane, 2015/10/30
 Chris Harris, 2015/11/27
 Valentyn Klindukh, 2016/01/15
+Wayne Chang, 2016/01/15