feature of last update notifier

[EdisonJwa]

Please make sure you took care of the following things before you submit this issue. Thank you!

• [ √ ] I have set up and configured my blog according to the Hexo docs and the Icarus docs;
• [ √ ] I have looked up Github issues and found no solutions to my problems.

---

I was just found this feature on my friend's blog,it will notify the visitors only if the post was posted long time ago (seems more than one and a half month) or will only show the post data and the last updated time If it's possible could you please add this feature to icarus? I think this is really useful feature not only for visitors but also for the website masters. this feature was found in a theme called suka