Adding instapaper.com to autoproxy_host

With the domain name instapaper.com not being included in autoproxy_host, pages of instapaper.com could be loaded, but without expected format (just the  plain format in visual), maybe the CSS URL is blocked. Adding instapaper.com to autoproxy_host solved this issue.

BTW: blog.instapaper.com is removed because the domain name includes it.