[stable/rabbitmq] Release 0.4.5 (#817)

* rabbitmq: update to `bitnami/rabbitmq:3.6.8-r0`

* rabbitmq: bump chart version to `0.4.5`

stable/rabbitmq/Chart.yaml

@@ -1,5 +1,5 @@
 name: rabbitmq
-version: 0.4.4
+version: 0.4.5
 description: Open source message broker software that implements the Advanced Message Queuing Protocol (AMQP)
 keywords:
 - rabbitmq

stable/rabbitmq/values.yaml

@@ -1,7 +1,7 @@
 ## Bitnami RabbitMQ image version
 ## ref: https://hub.docker.com/r/bitnami/rabbitmq/tags/
 ##
-image: bitnami/rabbitmq:3.6.7-r0
+image: bitnami/rabbitmq:3.6.8-r0
 
 ## Specify a imagePullPolicy
 ## 'Always' if imageTag is 'latest', else set to 'IfNotPresent'