ping method

@override Future<Result<bool, String>> ping()

check coingecko service

Implementation

@override
Future<Result<bool, String>> ping() async {
  final CoinGeckoResult<bool> result = await coingecko.ping();
  if (result.isError) {
    return Err(result.errorMessage);
  } else {
    return Ok(result.data);
  }
}