docs: add auth info and add annotation (#144)

* docs: add auth info and add annotation

* fix typo

README.md

@@ -29,6 +29,10 @@ for Pub/Sub before doing the [quickstart](#quickstart).
 
 Follow these [setup steps](https://cloud.google.com/pubsub/lite/docs/publish-receive-messages-console#before-you-begin)
 for Pub/Sub Lite before doing the [quickstart](#quickstart).
+
+For general information on how to authenticate with GCP when using the Google
+Cloud Pub/Sub Group Kafka Connector library, please visit [Provide credentials
+for Application Default Credentials](https://cloud.google.com/docs/authentication/provide-credentials-adc).
 
 ### Quickstart
 
@@ -395,7 +399,7 @@ This library follows [Semantic Versioning](http://semver.org/).
 
 Contributions to this library are always welcome and highly encouraged.
 
-See [CONTRIBUTING(CONTRIBUTING.md) for more information how to get started.
+See [CONTRIBUTING](CONTRIBUTING.md) for more information how to get started.
 
 Please note that this project is released with a Contributor Code of Conduct. By
 participating in this project you agree to abide by its terms.

pom.xml

@@ -3,7 +3,7 @@
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <artifactId>pubsub-group-kafka-connector</artifactId>
-  <version>0.1.3-SNAPSHOT</version>
+  <version>0.1.3-SNAPSHOT</version><!-- {x-version-update:pubsub-group-kafka-connector:current} -->
   <packaging>jar</packaging>
   <name>Pub/Sub Group Kafka Connector</name>
   <url>https://github.com/googleapis/java-pubsub-group-kafka-connector</url>