feat: add String() method on Region and Zone [APIGW-1521] (#251)

Author: loicbourgois

scw/locality.go

@@ -40,6 +40,11 @@ func (zone *Zone) Exists() bool {
 	return false
 }
 
+// String returns a Zone as a string
+func (zone *Zone) String() string {
+	return string(*zone)
+}
+
 // Region is a geographical location
 type Region string
 
@@ -172,3 +177,8 @@ func (region *Region) UnmarshalJSON(input []byte) error {
 	}
 	return nil
 }
+
+// String returns a Region as a string
+func (region *Region) String() string {
+	return string(*region)
+}