Release Vision 0.30.1

* Update documentation.

Release Video Intelligence 1.1.0

* Deprecate Google::Cloud::VideoIntelligence::Credentials.
  * Use Google::Cloud::VideoIntelligence::V1::Credentials instead.
* Update dependencies.
* Update documentation.

Release Translate 1.2.1

* Update documentation.

Release Trace 0.33.2

* Update documentation.

Release Text to Speech 0.1.1

* Update documentation.

Release Tasks 0.2.2

* Update documentation.

Release Storage 1.13.1

* Update documentation.

Release Speech 0.30.1

* Update documentation.

Release Spanner 1.6.1

* Update documentation.

Release Memorystore for Redis 0.2.0

* Move Credentials location:
  * Add Google::Cloud::Redis::V1beta1::Credentials
  * Remove Google::Cloud::Redis::Credentials
* Update dependencies.
* Update documentation.