code: func (h *Client) UpdateRelease(rlsName string, chstr string, opts ...UpdateOption) (*rls.UpdateReleaseResponse, error) {
  	// load the chart to update
  	chart, err := chartutil.Load(chstr)
  	if err != nil {
  		return nil, err
  	}
  
  	return h.UpdateReleaseFromChart(rlsName, chart, opts...)
  }
docs: // UpdateRelease loads a chart from chstr and updates a release to a new/different chart.