[stable/rabbitmq] Release 0.6.6 (#2000)

* rabbitmq: update to `bitnami/rabbitmq:3.6.11-r4`

* rabbitmq: bump chart version to `0.6.6`

stable/rabbitmq/Chart.yaml

@@ -1,5 +1,5 @@
 name: rabbitmq
-version: 0.6.5
+version: 0.6.6
 appVersion: 3.6.11
 description: Open source message broker software that implements the Advanced Message Queuing Protocol (AMQP)
 keywords:

stable/rabbitmq/values.yaml

@@ -1,7 +1,7 @@
 ## Bitnami RabbitMQ image version
 ## ref: https://hub.docker.com/r/bitnami/rabbitmq/tags/
 ##
-image: bitnami/rabbitmq:3.6.11-r3
+image: bitnami/rabbitmq:3.6.11-r4
 
 ## Specify a imagePullPolicy
 ## 'Always' if imageTag is 'latest', else set to 'IfNotPresent'