storage/s3.go
func (s *S3Bucket) NewWriter(path string) (io.WriteCloser, error) {
	return s.bucket.PutWriter(path, nil, nil)
}
func (s *S3Bucket) NewWriter(path string) (io.WriteCloser, error) {
	return s.bucket.PutWriter(path, nil, nil)
}
//NewWriter - get a new s3 writer