Add kafka-streams to version override appendix

Author: garyrussell

src/reference/asciidoc/appendix.adoc

@@ -27,6 +27,13 @@ When you use `spring-kafka-test` (version 2.4.x) with Spring Boot, you need to o
     <version>2.4.1</version>
 </dependency>
 
+<!-- optional - only needed when using kafka-streams -->
+<dependency>
+    <groupId>org.apache.kafka</groupId>
+    <artifactId>kafka-streams</artifactId>
+    <version>2.4.1</version>
+</dependency>
+
 <dependency>
     <groupId>org.apache.kafka</groupId>
     <artifactId>kafka-clients</artifactId>
@@ -59,15 +66,16 @@ When you use `spring-kafka-test` (version 2.4.x) with Spring Boot, you need to o
 ----
 dependencies {
 
-	implementation 'org.springframework.kafka:spring-kafka:{project-version}'
+    implementation 'org.springframework.kafka:spring-kafka:{project-version}'
 
-	implementation 'org.apache.kafka:kafka-clients:2.4.1'
-	testImplementation ('org.springframework.kafka:spring-kafka-test:{project-version}') {
-		exclude module: 'kafka_2.11'
-	}
-	testImplementation 'org.apache.kafka:kafka-clients:2.4.1:test'
-	testImplementation 'org.apache.kafka:kafka_2.12:2.4.1'
-	testImplementation 'org.apache.kafka:kafka_2.12:2.4.1:test'
+    implementation 'org.apache.kafka:kafka-clients:2.4.1'
+    implementation 'org.apache.kafka:kafka-streams:2.4.1' // optional - only needed when using kafka-streams
+    testImplementation ('org.springframework.kafka:spring-kafka-test:{project-version}') {
+        exclude module: 'kafka_2.11'
+    }
+    testImplementation 'org.apache.kafka:kafka-clients:2.4.1:test'
+    testImplementation 'org.apache.kafka:kafka_2.12:2.4.1'
+    testImplementation 'org.apache.kafka:kafka_2.12:2.4.1:test'
 
 }
 ----