Uses amqp as the default sender name

Author: sroze

symfony/messenger/4.1/config/packages/messenger.yaml

@@ -2,8 +2,8 @@ framework:
     messenger:
         adapters:
             # Uncomment the following line to enable a default adapter
-            # default: "%env(MESSENGER_ADAPTER_DSN)%"
+            # amqp: "%env(MESSENGER_ADAPTER_DSN)%"
 
         routing:
             # Route your messages to the senders...
-            # 'App\Message\YourMessage': messenger.default_sender
+            # 'App\Message\YourMessage': messenger.sender.amqp