Icon Request: fa-versions
I'd like to have an icon for menu in Wiki, to show the different versions of a page and to revert to an old version (an icon "hystory" or "versions"). Something like this :
![icon-versions](https://user-images.githubusercontent.com/3955499/44944996-e15c4400-ade0-11e8-84d9-7c060c654e9a.png)
