Adding upgrade docs

Nyholm · Nyholm · commit 2e52edfb92fe · 2020-01-22T15:43:47.000+01:00
diff --git a/UPGRADE-6.0.md b/UPGRADE-6.0.md
@@ -19,6 +19,13 @@ HttpFoundation
    `RedirectResponse::create()`, and `StreamedResponse::create()` methods (use
    `__construct()` instead)
 
+Messenger
+---------
+
+ * Removed AmqpExt transport. Run `composer require symfony/messenger-amqp` to keep the transport in your application..
+ * Removed Doctrine transport. Run `composer require symfony/messenger-doctrine` to keep the transport in your application..
+ * Removed RedisExt transport. Run `composer require symfony/messenger-redis` to keep the transport in your application..
+
 Routing
 -------
 
