chore: release 2.0.0 (#164)
chore: release 2.0.0 (#164)

* updated CHANGELOG.md [ci skip]

* updated package.json [ci skip]

* updated samples/package.json

Co-authored-by: release-please[bot] <6fb7beb84df8ef60a675db3372864553c0b582c5@users.noreply.github.com>
GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples