message: fix(umd): export fetch namespace
diff: @@ -20,3 +20,7 @@ export const ajax = _ajax;
  /* rxjs.webSocket */
  import * as _webSocket from '../webSocket/index';
  export const webSocket = _webSocket;
  +
  +/* rxjs.fetch */
  +import * as _fetch from '../fetch/index';
  +export const fetch = _fetch;
  