error in ie8

[mraiguo]

When I use the example of ie8（index-ie8.html）it report an error： TypeError: 对象不支持此属性或方法

[kaidjohnson]

I can't read Chinese, but reading through the source code, I did spot a Date.now() which will cause problems in IE8. https://github.com/camsong/fetch-jsonp/blob/master/src/fetch-jsonp.js#L8

Should either change documented support to IE9+ or replace with new Date().getTime();.

Workaround is to include a Date.now() polyfill in your application above the code that uses fetch-jsonp:

if (!Date.now) {
  Date.now = function () {
    return new Date().getTime();
  };
}

[mraiguo]

@kaidjohnson sorry，I've found it，But forget to submit a pr，thanks