code: func (Pipe) Default(ctx *context.Context) error {
  	for i := range ctx.Config.S3 {
  		s3 := &ctx.Config.S3[i]
  		if s3.Bucket == "" {
  			continue
  		}
  		if s3.Folder == "" {
  			s3.Folder = "{{ .ProjectName }}/{{ .Tag }}"
  		}
  		if s3.Region == "" {
  			s3.Region = "us-east-1"
  		}
  		if s3.ACL == "" {
  			s3.ACL = "private"
  		}
  	}
  	return nil
  }
docs: // Default sets the pipe defaults