code: function makeKillmail(agent) {
      return function (id, hash) {
          return agent.request('get_killmails_killmail_id_killmail_hash', { path: { killmail_id: id, killmail_hash: hash } });
      };
  }
docs: Create a new {@link Killmail} instance that uses the given `agent` to
  make its HTTP requests to the ESI interface.
  
  @param agent The agent making actual requests
  @returns A Killmail API instance