Update README.md

(cherry picked from commit 5e79ea9)

deps/rabbitmq_amqp1_0/README.md

@@ -1,11 +1,11 @@
-This AMQP 1.0 plugin is deprecated and exists only for backward compatibility.
-
-From RabbitMQ `v4.x` onwards, AMQP 1.0 is supported natively by RabbitMQ and all AMQP 1.0 code was moved from this directory to the core [rabbit](../rabbit/) app.
+In RabbitMQ `4.x`, AMQP 1.0 is a [core protocol](https://www.rabbitmq.com/docs/amqp) that is always supported and does not
+require a plugin to be enabled.
 
 This no-op plugin exists only such that deployment tools can continue to enable and disable this plugin without erroring:
+
 ```
 rabbitmq-plugins enable rabbitmq_amqp1_0
 rabbitmq-plugins disable rabbitmq_amqp1_0
 ```
-Enabling or disabling this plugin has no effect.
-RabbitMQ `v4.x` supports AMQP 1.0 by default.
+
+Enabling or disabling this plugin has no effect on AMQP 1.0 support scope or clients.