Update README.md

Author: senghe

README.md

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 # BitBag SyliusWishlistPlugin
 
+**Deprecation note.** This repository supports Sylius 1.x versions only. The Sylius 2.x support is currently handled by Sylius team ([link to the repository](https://github.com/Sylius/WishlistPlugin)).
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 [ ![](https://img.shields.io/packagist/l/bitbag/wishlist-plugin.svg) ](https://packagist.org/packages/bitbag/wishlist-plugin "License")