Update README.md

Author: AndrewRH

README.md

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 # AVPro Video
-[AVPro Video](http://renderheads.com/product/avpro-video/) is a multi-platform Unity plugin for advanced video playback
+[AVPro Video](http://renderheads.com/products/avpro-video/) is a multi-platform Unity plugin for advanced video playback
 
 This Github page is primarily for **reporting bugs and feature requests**.