Update README.md

Author: Designmodo

README.md

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 Flat UI Free
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-Flat UI Free is licensed under a Creative Commons Attribution 3.0 Unported (CC BY 3.0)  (http://creativecommons.org/licenses/by/3.0/). 
+Flat UI Free is licensed under a Creative Commons Attribution 3.0 Unported (CC BY 3.0)  (http://creativecommons.org/licenses/by/3.0/) and MIT License - http://opensource.org/licenses/mit-license.html. 
 
 You are allowed to use these elements anywhere you want, however we’ll highly appreciate if you will link to our website when you share them - http://designmodo.com