Update README.md

Author: AndrewRH

README.md

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 # AVPro Live Camera
-[AVPro Live Camera](http://renderheads.com/product/av-pro-live-camera/) is a Unity plugin for webcams, TV cards and capture cards
+[AVPro Live Camera](http://renderheads.com/products/avpro-live-camera/) is a Unity plugin for webcams, TV cards and capture cards
 
 This Github page is primarily for **reporting bugs and feature requests**.