LU.yaml in countries-3.1.0

- old
+ new

@@ -32,9 +32,10 @@
     - 8
     - 14
     super_reduced: 3
     parking: 12
   postal_code: true
+  postal_code_format: "\\d{4}"
   unofficial_names:
   - Luxembourg
   - Luxemburg
   - Luxemburgo
   - ルクセンブルク