Readme tweak
Readme tweak

Change-Id: I0007356f1df993ae342a58a36ce795a4b153b7ab

googlearchive/cloud-pubsub-samples-java,GoogleCloudPlatform/cloud-pubsub-samples-java,googlearchive/cloud-pubsub-samples-java,googlearchive/cloud-pubsub-samples-java,GoogleCloudPlatform/cloud-pubsub-samples-java,GoogleCloudPlatform/cloud-pubsub-samples-java