Fix markup in comment (#736)

README.md

@@ -104,7 +104,7 @@ For a private App you just need to set the base site url as follows:
    ```ruby
    shop_url = "https://#{API_KEY}:#{PASSWORD}@#{SHOP_NAME}.myshopify.com"
    ShopifyAPI::Base.site = shop_url
-   ShopifyAPI::Base.api_version = '<version_name>' # find the latest stable api_version [here](https://shopify.dev/concepts/about-apis/versioning)
+   ShopifyAPI::Base.api_version = '<version_name>' # find the latest stable api_version here: https://shopify.dev/concepts/about-apis/versioning
    ```
 
    That's it; you're done! Next, skip to step 6 and start using the API!