NE.yaml in countries-3.1.0

- old
+ new

@@ -18,9 +18,10 @@
   subregion: Western Africa
   world_region: EMEA
   un_locode: NE
   nationality: Nigerian
   postal_code: true
+  postal_code_format: "\\d{4}"
   unofficial_names:
   - Niger
   - Níger
   - ニジェール
   languages_official: