RetryStrategy should return a Future<bool>.
RetryStrategy should return a Future<bool>.

google/streamy-dart,ronlobo/streamy-dart,ronlobo/streamy-dart,google/streamy-dart,srawlins/streamy-dart,google/streamy-dart,srawlins/streamy-dart,srawlins/streamy-dart,google/streamy-dart,srawlins/streamy-dart,ronlobo/streamy-dart,ronlobo/streamy-dart