Support new AWS regions: eu-north-1 and us-gov-east-1 (#1060)
Support new AWS regions: eu-north-1 and us-gov-east-1 (#1060)

https://aws.amazon.com/about-aws/whats-new/2018/11/announcing-the-new-aws-govcloud-us-east-region/
https://aws.amazon.com/about-aws/whats-new/2018/12/announcing-the-aws-europe-stockholm-region/
harshavardhana/minio-go,minio/minio-go