chore(master): release 0.2.1-SNAPSHOT (#80)

🤖 I have created a release \*beep\* \*boop\* 
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### Updating meta-information for bleeding-edge SNAPSHOT release.
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This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

pom.xml

@@ -8,7 +8,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>pubsublite-kafka</artifactId>
-  <version>0.2.0</version><!-- {x-version-update:pubsublite-kafka:current} -->
+  <version>0.2.1-SNAPSHOT</version><!-- {x-version-update:pubsublite-kafka:current} -->
   <packaging>jar</packaging>
   <name>Pub/Sub Lite Kafka Shim</name>
   <url>https://github.com/googleapis/java-pubsublite-kafka</url>

versions.txt

@@ -1,4 +1,4 @@
 # Format:
 # module:released-version:current-version
 
-pubsublite-kafka:0.2.0:0.2.0
+pubsublite-kafka:0.2.0:0.2.1-SNAPSHOT