Release google-cloud-storage 1.18.2 (googleapis#3406)

* Declare explicit dependency on mime-types

Release google-cloud-pubsub 0.36.0 (googleapis#3403)

* Add Topic#kms_key
  * Add the Cloud KMS encryption key that will be used to
    protect access to messages published on a topic.
* Updates to the low-level API:
  * Add Topic#kms_key_name (experimental)
  * Snapshots no longer marked beta.
  * Update IAM documentation.

Release google-cloud-bigtable 0.4.0 (googleapis#3404)

* Add Google::Cloud::Bigtable::VERSION
* Set gRPC headers to allow maximum message size
* Fix errors in code sample documentation

Release google-cloud-bigquery 1.11.1 (googleapis#3405)

* Declare explicit dependency on mime-types

Release google-cloud-talent 0.3.0 (googleapis#3379)

Release google-cloud-security_center 0.2.0 (googleapis#3287)

* Update SecurityCenterClient#run_asset_discovery response value.
  * The long running Operation response type has been updated to
    RunAssetDiscoveryResponse instead of Google::Protobuf::Empty.
* Add RunAssetDiscoveryResponse.

Release google-cloud-vision 0.33.0 (googleapis#3280)

* Add ImageAnnotatorClient#batch_annotate_files
  * Add AnnotateFileRequest
  * Add BatchAnnotateFilesRequest
  * Add BatchAnnotateFilesResponse
* Add ImageAnnotatorClient#async_batch_annotate_images
  * Add AsyncBatchAnnotateImagesRequest
  * Add AsyncBatchAnnotateImagesResponse
* Add AnnotateFileResponse#total_pages
* Add InputConfig#content
* Update documentation

Release google-cloud 0.59.0 (googleapis#3282)

* Add google-cloud-security_center.
* Add google-cloud-phishing_protection.
* Add google-cloud-recaptcha_enterprise.

Release google-cloud-webrisk 0.1.1 (googleapis#3272)

* Add AUTHENTICATION.md guide.
* Update documentation for common types.

Release google-cloud-vision 0.32.3 (googleapis#3271)

* Add AUTHENTICATION.md guide.
* Update documentation for common types.
* Update generated documentation.
* Update generated code examples.
* Remove Python code example from documentation.
* Extract gRPC header values from request.