updated sr-users mailing list address

kamailio-install-guide-deb/docs/support.md

@@ -3,7 +3,7 @@
 Questions about how to use Kamailio and the content of kamailio.cfg can be
 addressed via email to:
 
-  * [sr-users@lists.sip-router.org](http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users)
+  * [sr-users@lists.kamailio.org](http://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users)
 
 More documentation resources can be found at: