Readme CMS versioning

Author: acoumb

src/Umbraco.Cms.Integrations.Commerce.Shopify/readme.md

@@ -5,7 +5,10 @@ for products within a simple [Shopify](https://www.shopify.com/) store or throug
 
 ## Prerequisites
 
-Requires minimum version of Umbraco CMS: 8.5.4.
+Required minimum versions of Umbraco CMS:
+
+- 8.5.4 for version 8
+- 9.0.1 for version 9
 
 ## How To Use
 
@@ -81,4 +84,4 @@ To copy the front-end assets to the test site While in DEBUG mode, use following
   set ShopifyDir=%UmbracoCmsIntegrationsTestsiteV8Path%\App_Plugins\UmbracoCms.Integrations\Commerce\Shopify
   if not exist %ShopifyDir% mkdir -p %ShopifyDir%
   xcopy "$(ProjectDir)App_Plugins\UmbracoCms.Integrations\Commerce\Shopify" "%ShopifyDir%" /e /y
-```
+```