SZ.yaml in countries-5.7.0

- old
+ new

@@ -3,9 +3,10 @@
   alpha2: SZ
   alpha3: SWZ
   continent: Africa
   country_code: '268'
   currency_code: SZL
+  distance_unit: KM
   gec: WZ
   geo:
     latitude: -26.522503
     longitude: 31.465866
     max_latitude: -25.71792