Update README.md

Author: Lootyhoof

README.md

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 # White Moon
-![Preview](http://i67.tinypic.com/jh4gba.png)
+![Preview](https://i.imgur.com/0nXfFs3.png)
 
 Fork of the theme [Simple White](https://github.com/louischan/simplewhite) by Louis Chan for Pale Moon with elements ported from [Simple White X](https://github.com/johngraciliano/simplewhite).