Adding release notes for Service Bus. (#1679)

* Adding release notes.

releases/2020-08/java.md

@@ -26,6 +26,7 @@ The Azure SDK team is pleased to announce our August 2020 client library release
 - Azure Core Management
 - Azure Core Tracing OpenTelemetry
 - Form Recognizer
+- Azure Service Bus
 
 ## Installation Instructions
 
@@ -80,6 +81,12 @@ To use the GA and beta libraries, refer to the Maven dependency information belo
   <artifactId>azure-data-appconfiguration</artifactId>
   <version>1.1.4</version>
 </dependency>
+
+<dependency>
+  <groupId>com.azure</groupId>
+  <artifactId>azure-messaging-servicebus</artifactId>
+  <version>7.0.0-beta.5</version>
+</dependency>
 ```
 
 ## Feedback
@@ -184,9 +191,21 @@ Detailed changelogs are linked from the [Quick Links](#quick-links) below. Here
 #### New features
 - Added support for context passing.
 
-### Key Bug Fixes
+#### Key Bug Fixes
 - Fixed `getFields()` on `RecognizedForm` to preserve service side ordering of fields.
 
+### Azure Service Bus ([Changelog](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/servicebus/azure-messaging-servicebus/CHANGELOG.md#700-beta5-2020-08-11))
+
+#### New features
+- Automatic lock renewal using LockRenewalOperation.
+- A timeout period is added when synchronously receiving messages.
+
+#### Breaking changes
+- Service Bus queue, topic, and subscription creation are done through CreateQueueOptions,
+  CreateTopicOptions, and CreateSubscriptionOptions.
+- Only updateable properties on QueueProperties, TopicProperties, and SubscriptionProperties are exposed
+- MessageDetailCount is flattened and removed in QueueRuntimeInfo, TopicRuntimeInfo, and SubscriptionRuntimeInfo.
+
 ## Need help
 
 - For reference documentation visit the [Azure SDK for Java documentation](https://azure.github.io/azure-sdk-for-java/).