putValue method
Implementation
Future<String> putValue(String atsign, String key, String value) async {
try {
assert(atsign != '');
await FlutterKeychain.put(key: atsign + ':' + key, value: value);
} on Exception catch (e) {
_logger.severe(
'flutter keychain - exception in put value for $key :${e.toString()}');
}
return value;
}