Update README.md

README.md

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 LittlevGL provides everything you need to create a Graphical User Interface (GUI) on embedded systems with easy-to-use graphical elements, beautiful visual effects and low memory footprint.
 
-Homepage: http://gl.littlev.hu
+Homepage: http://www.gl.littlev.hu
 
 ### Table Of Content
 * [Key features](#key-features)