Update NEWS.md

Co-authored-by: Etienne Bacher <52219252+etiennebacher@users.noreply.github.com>

Author: strengejacke

NEWS.md

@@ -8,7 +8,7 @@ CHANGES
 * `data_tabulate()` was revised and gets several new arguments: a `weights`
   argument, to compute weighted frequency tables. `include_na` allows to include
   or omit missing values from the table. Furthermore, a `by` argument was added,
-  to compute crosstables.
+  to compute crosstables (#479, #481).
 
 # datawizard 0.9.1