I've used the minio-go client library for about a year now. I don't see anything in the minio-go README or elsewhere to make me think it will no longer be supported. In fact, the most recently merged PR was yesterday. There are some other Go S3 clients, like https://github.com/kelindar/s3, but I don't know if any other Go S3 clients have the complete set of features that minio-go has.