docs: def update_readme(self, content):
          """Update the readme descriptive metadata."""
          logger.debug("Updating readme")
          key = self.get_readme_key()
  
          # Back up old README content.
          backup_content = self.get_readme_content()
          backup_key = key + "-{}".format(
              timestamp(datetime.datetime.now())
          )
          logger.debug("README.yml backup key: {}".format(backup_key))
          self.put_text(backup_key, backup_content)
  
          self.put_text(key, content)