chore: release 2.2.0 (#243)

🤖 I have created a release \*beep\* \*boop\* 
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## [2.2.0](https://www.github.com/googleapis/nodejs-datalabeling/compare/v2.1.2...v2.2.0) (2021-01-09)


### Features

* introduces style enumeration ([#242](https://www.github.com/googleapis/nodejs-datalabeling/issues/242)) ([34bd1ec](https://www.github.com/googleapis/nodejs-datalabeling/commit/34bd1ec34d76976cbb96ee75892a62500dbd3cef))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

Author: release-please[bot]

datalabeling/package.json

@@ -14,7 +14,7 @@
     "test": "mocha --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/datalabeling": "^2.1.2"
+    "@google-cloud/datalabeling": "^2.2.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",