alert to Mac users

README

@@ -3,9 +3,7 @@ htop
 
 by Hisham Muhammad <hisham@gobolinux.org>
 
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-[![Support via Gittip](https://rawgithub.com/twolfson/gittip-badge/0.2.0/dist/gittip.png)](https://www.gittip.com/hishamhm/)
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+![Alert](http://i.imgur.com/ugIqB9s.png) *Mac users, [click here](https://www.bountysource.com/fundraisers/554-mac-os-x-support-in-the-official-htop-1-x-tree)!* The htop version you are using is a 5-year old fork -- help bring htop 1.x to the Mac!
 
 May, 2004 - January, 2014