Merge pull request #33 from googleapis/admin-readme

Update readme samples to reflect new admin client.

Author: dpcollins-google

README.md

@@ -105,11 +105,12 @@ Topic topic =
  .setName(topicPath.value())
  .build();
 
-AdminClient client = AdminClientBuilder.builder()
- .setRegion(region)
- .setExecutor(executor)
- .build();
-client.createTopic(topic).get();
+try (AdminClient client =
+ AdminClientBuilder.builder()
+ .setRegion(region)
+ .build()) {
+ client.createTopic(topic).get();
+}
 ```
 
 #### Publishing messages
@@ -217,11 +218,12 @@ Subscription.newBuilder()
  .setTopic(topicPath.value())
  .build();
 
-AdminClient client = AdminClientBuilder.builder()
- .setRegion(region)
- .setExecutor(executor)
- .build();
-client.createSubscription(subscription).get();
+try (AdminClient client =
+ AdminClientBuilder.builder()
+ .setRegion(region)
+ .build()) {
+ client.createSubscription(subscription).get();
+}
 ```
 
 #### Receiving messages