Updates required for embedded apps to work on the new Shopify admin domain

The Shopify admin is moving to a new domain: admin.shopify.com. Embedded apps should migrate to App Bridge 3.0 as soon as possible to ensure the best merchant experience in this new domain.

The following requirements must be met for embedded apps to load in admin.shopify.com. Until these requirements are met, merchants will be forced to redirect to the old admin domain to use the app:

1. The content security policy includes admin.shopify.com.
2. The app is on App Bridge 2.0.5 or higher, and has correctly implemented the host parameter. App Bridge 3.0 is recommended.