Release google-cloud-asset 0.4.0. (googleapis#8890)

Release bigquery 1.18.0 (googleapis#8995)

Release google-cloud-storage 1.18.0. (googleapis#8985)

Release 'google-cloud-firestore 1.4.0'. (googleapis#8982)

Release 1.12.1 (googleapis#8881)

Release 0.7.0 (googleapis#8861)

Release 0.4.1 (googleapis#8862)

Release pubsub 0.45.0 (googleapis#8839)

* Release 0.45.0

* Remove redundant PubSub prefix from changelog item

Release google-cloud-container 0.3.0 (googleapis#8830)

Release 0.34.0 (googleapis#8827)