Add Kayako in the India section

GoUsers.md

diff --git a/GoUsers.md b/GoUsers.md
index 01d885b..50e0f12 100644
--- a/GoUsers.md
+++ b/GoUsers.md
@@ -236,6 +236,7 @@
   * [Fastah](http://fastah.blackbuck.mobi/)
   * [Josh Software](http://www.joshsoftware.com/)
   * [JusTickets - built with Go](https://www.justickets.in/cities)
+  * [Kayako](http://www.kayako.com/)
   * [Sahaj Software Solutions](http://www.sahajsoft.com/)
   * [Siminars](http://siminars.com)
   * [SoStronk](https://www.sostronk.com/)