README: update status of select clients

DO NOT SUBMIT until beta announced.

Change-Id: Icbe314d661acbcdc1e2534a63d8e723018f1dd97
Reviewed-on: https://code-review.googlesource.com/9750
Reviewed-by: Michael Darakananda <pongad@google.com>
Reviewed-by: Ross Light <light@google.com>

README.md

@@ -144,10 +144,10 @@ Google API                     | Status       | Package
 -------------------------------|--------------|-----------------------------------------------------------
 [Datastore][cloud-datastore]   | beta         | [`cloud.google.com/go/datastore`][cloud-datastore-ref]
 [Storage][cloud-storage]       | beta         | [`cloud.google.com/go/storage`][cloud-storage-ref]
-[Pub/Sub][cloud-pubsub]        | experimental | [`cloud.google.com/go/pubsub`][cloud-pubsub-ref]
 [Bigtable][cloud-bigtable]     | beta         | [`cloud.google.com/go/bigtable`][cloud-bigtable-ref]
-[BigQuery][cloud-bigquery]     | experimental | [`cloud.google.com/go/bigquery`][cloud-bigquery-ref]
-[Logging][cloud-logging]       | experimental | [`cloud.google.com/go/logging`][cloud-logging-ref]
+[BigQuery][cloud-bigquery]     | beta         | [`cloud.google.com/go/bigquery`][cloud-bigquery-ref]
+[Logging][cloud-logging]       | beta         | [`cloud.google.com/go/logging`][cloud-logging-ref]
+[Pub/Sub][cloud-pubsub]        | experimental | [`cloud.google.com/go/pubsub`][cloud-pubsub-ref]
 [Vision][cloud-vision]         | experimental | [`cloud.google.com/go/vision`][cloud-vision-ref]
 [Language][cloud-language]     | experimental | [`cloud.google.com/go/language/apiv1beta1`][cloud-language-ref]
 [Speech][cloud-speech]         | experimental | [`cloud.google.com/go/speech/apiv1beta`][cloud-speech-ref]