[openaddresses] add Västerås, Sweden

resources/parser/data_sets/openaddresses.yaml

@@ -1589,6 +1589,7 @@ countries:
             - filename: municipality_of_malmo.csv
             - filename: municipality_of_savsjö.csv
             - filename: municipality_of_stockholm.csv
+            - filename: municipality_of_vasteras.csv
             - filename: municipality_of_vaxholm.csv
             - filename: municipality_of_vaxjo.csv