docs: def upgrade(self, remote=None):
          """
              Upgrade the plugin.
  
              Args:
                  remote (string): Remote reference to upgrade to. The
                      ``:latest`` tag is optional and is the default if omitted.
                      Default: this plugin's name.
  
              Returns:
                  A generator streaming the decoded API logs
          """
          if self.enabled:
              raise errors.DockerError(
                  'Plugin must be disabled before upgrading.'
              )
  
          if remote is None:
              remote = self.name
          privileges = self.client.api.plugin_privileges(remote)
          for d in self.client.api.upgrade_plugin(self.name, remote, privileges):
              yield d
          self._reload()