def update(name, html_url, zip_url)
      options = { :body => {
        :Name => name,
        :HtmlPageURL => html_url,
        :ZipFileURL => zip_url }.to_json }
      put "/templates/#{template_id}.json", options
    end
def update(name, html_url, zip_url)
      options = { :body => {
        :Name => name,
        :HtmlPageURL => html_url,
        :ZipFileURL => zip_url }.to_json }
      put "/templates/#{template_id}.json", options
    end
Updates this email template.