Maint: hardcoded data in JSON embedded file

- Server information, versions and timestamps together in internal/constants/servers.json
- breaking change: updater cli uses -enduser instead of -file
- breaking change: updater cli uses -maintainer instead of -stdout
- Fix: replace special last a character with 'a' from Bogota for PrivateVPN
- Feat: do not write out servers and timestamp if no change was detected

internal/updater/providers/privatevpn/filename.go

@@ -48,7 +48,11 @@ func parseFilename(fileName string) (
 			errNotEnoughParts, fileName)
 	}
 	countryCode, city = parts[0], parts[1]
+
 	countryCode = strings.ToLower(countryCode)
+	if countryCode == "co" && strings.HasPrefix(city, "Bogot") {
+		city = "Bogota"
+	}
 
 	return countryCode, city, nil
 }