Add chillar anand to contributors

CONTRIBUTORS.txt

@@ -213,3 +213,4 @@ Takeshi Kanemoto, 2016/04/22
 Arthur Vuillard, 2016/04/22
 Colin McIntosh, 2016/04/26
 Jeremy Zafran, 2016/05/17
+Anand Reddy Pandikunta, 2016/06/18