erlang R14-18 compatibility
diff --git a/src/global_changes_listener.erl b/src/global_changes_listener.erl
index 87a0268..9adf0e1 100644
--- a/src/global_changes_listener.erl
+++ b/src/global_changes_listener.erl
@@ -154,7 +154,8 @@
     maybe_send_updates(State).
 
 
--spec group_updates_by_node(binary(), [binary()]) -> dict().
+%% restore spec when R14 support is dropped
+%% -spec group_updates_by_node(binary(), [binary()]) -> dict:dict().
 group_updates_by_node(DbName, Updates) ->
     lists:foldl(fun(Key, OuterAcc) ->
         Shards = mem3:shards(DbName, Key),