code: func NewRelease(bundle, version string) (*Release, error) {
  	r := &Release{
  		Bundle:     bundle,
  		Version:    version,
  		ReleasedAt: time.Now().Unix(),
  	}
  
  	if !r.validBundle() {
  		return nil, r.errInvalidBundle()
  	}
  
  	return r, nil
  }
docs: // NewRelease verifies the bundle is valid, and creates a new Release
  // with the current time stamp.