Add readme link to v1

Author: Daniel

README.md

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 A set of files used to implement a simple customer wishlist on a Shopify store.
 
+_Version: 2.0.0_ [Looking for Version 1.0.0?](https://github.com/dlerm/shopify-wishlist/tree/version/1.0.0)
+
 ## Installation
 
 To begin using **Shopify Wishlist**, you must copy some of the files in this repo into your Shopify theme code.