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] <55107282+release-please[bot]@users.noreply.github.com>

Author: release-please[bot]

talent/package.json

@@ -15,7 +15,7 @@
     "test": "mocha --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/talent": "^1.7.1"
+    "@google-cloud/talent": "^2.0.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",