Release google-cloud-vision 0.36.0 (googleapis#4059)

Release google-cloud-talent 0.6.0 (googleapis#4131)

Release google-cloud-speech 0.38.0 (googleapis#4003)

Release google-cloud-monitoring 0.32.0 (googleapis#4130)

Release google-cloud-logging 1.8.0 (googleapis#4126)

Release google-cloud-language 0.34.0 (googleapis#4129)

Release google-cloud-bigquery-data_transfer 0.3.1 (googleapis#4128)

Release google-cloud-bigquery 1.16.0 (googleapis#4132)

#### Features

* Add Dataset default_encryption
  * Add Dataset#default_encryption
  * Add Dataset#default_encryption=

Release google-cloud-asset 0.3.3 (googleapis#4127)

Release grafeas-client 0.3.0 (googleapis#4004)