GF.yaml in countries-5.7.0

- old
+ new

@@ -3,9 +3,10 @@
   alpha2: GF
   alpha3: GUF
   continent: South America
   country_code: '594'
   currency_code: EUR
+  distance_unit: KM
   eu_member: true
   euvat_member: false
   gec: FG
   geo:
     latitude: 3.933889