Register service

COUCHDB-2796
diff --git a/src/global_changes_sup.erl b/src/global_changes_sup.erl
index 4d32f84..aed424e 100644
--- a/src/global_changes_sup.erl
+++ b/src/global_changes_sup.erl
@@ -24,6 +24,7 @@
 
 
 init([]) ->
+    couch_epi:register_service(global_changes),
     global_changes_config_listener:subscribe(),
     {ok, {
         {one_for_one, 5, 10}, [