chore: release 2.2.0 (#481)

* updated CHANGELOG.md [ci skip]

* updated package.json [ci skip]

* updated samples/package.json [ci skip]

Author: yoshi-automation

core/common/CHANGELOG.md

@@ -4,6 +4,18 @@
 
 [1]: https://www.npmjs.com/package/@google-cloud/common?activeTab=versions
 
+## [2.2.0](https://www.github.com/googleapis/nodejs-common/compare/v2.1.2...v2.2.0) (2019-09-11)
+
+
+### Bug Fixes
+
+* **docs:** remove anchor from reference doc link ([#474](https://www.github.com/googleapis/nodejs-common/issues/474)) ([81ebc1f](https://www.github.com/googleapis/nodejs-common/commit/81ebc1f))
+
+
+### Features
+
+* return more helpful error when authentication fails ([#480](https://www.github.com/googleapis/nodejs-common/issues/480)) ([98d2b7f](https://www.github.com/googleapis/nodejs-common/commit/98d2b7f))
+
 ### [2.1.2](https://www.github.com/googleapis/nodejs-common/compare/v2.1.1...v2.1.2) (2019-08-14)
 
 

core/common/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@google-cloud/common",
   "description": "Common components for Cloud APIs Node.js Client Libraries",
-  "version": "2.1.2",
+  "version": "2.2.0",
   "license": "Apache-2.0",
   "author": "Google Inc.",
   "engines": {