Added version support information to readme
Added version support information to readme

GoogleCloudPlatform/pubsub,GoogleCloudPlatform/pubsub,kamalaboulhosn/pubsub,GoogleCloudPlatform/pubsub,kamalaboulhosn/pubsub,GoogleCloudPlatform/pubsub,kamalaboulhosn/pubsub,kamalaboulhosn/pubsub,kamalaboulhosn/pubsub,GoogleCloudPlatform/pubsub