Increase KafkaIO version to 0.2.0

Recent PR GoogleCloudPlatform#491 changes how KafkaIO splits. This makes it incompatible
with Dataflow update across these two versions.

Author: Raghu Angadi

contrib/kafka/pom.xml

@@ -25,7 +25,7 @@
     <artifactId>google-cloud-dataflow-java-contrib-kafka</artifactId>
     <name>Google Cloud Dataflow Kafka IO Library</name>
     <description>Library to read Kafka topics.</description>
-    <version>0.1.0-SNAPSHOT</version>
+    <version>0.2.0-SNAPSHOT</version>
 
     <properties>
       <dataflow.version>[1.6.0, 2.0.0)</dataflow.version>