Release stackdriver-core 1.3.4 (googleapis#3936)

#### Documentation
	
* Update documentation

Release stackdriver 0.15.5 (googleapis#3935)

#### Documentation
	
* Update documentation

Release grafeas-client 0.2.1 (googleapis#3934)

#### Documentation
	
* Update documentation

Release google-cloud-webrisk 0.2.1 (googleapis#3933)

#### Documentation
	
* Update documentation

Release google-cloud-translate 1.3.1 (googleapis#3932)

#### Documentation
	
* Update documentation

Release google-cloud-trace 0.35.0 (googleapis#3931)

#### Features

* Support overriding of service endpoint

#### Documentation

* Update documentation

Release google-cloud-text_to_speech 0.4.1 (googleapis#3930)

#### Documentation

* Update documentation

Release google-cloud-tasks 1.1.1 (googleapis#3929)

#### Documentation

* Update documentation

Release google-cloud-talent 0.5.0 (googleapis#3928)

#### Features

* Add path helpers
  * Add company_without_tenant_path, job_without_tenant_path, and project_path.
* Add Profile#derived_addresses

#### Performance Improvements

* Update timeout_millis in client configs

#### Documentation

* Update documentation

Release google-cloud-speech 0.37.0 (googleapis#3927)

#### Features

* Add RecognitionConfig#diarization_config
* Add SpeakerDiarizationConfig

#### Documentation

* Update documentation