chore: release 2.2.0 (#45)

🤖 I have created a release \*beep\* \*boop\* 
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## [2.2.0](https://www.github.com/googleapis/nodejs-dialogflow-cx/compare/v2.1.0...v2.2.0) (2021-01-09)


### Features

* adds style enumeration ([#49](https://www.github.com/googleapis/nodejs-dialogflow-cx/issues/49)) ([6d65571](https://www.github.com/googleapis/nodejs-dialogflow-cx/commit/6d655718327044ea6e77bc8501c805b5cd3fc4e2))
* allowed custom to specify webhook headers through query parameters docs: suggested to always use version for production traffic when calling DetectIntent ([#44](https://www.github.com/googleapis/nodejs-dialogflow-cx/issues/44)) ([0ffd0b7](https://www.github.com/googleapis/nodejs-dialogflow-cx/commit/0ffd0b7a8a2f34c06062c9baf4f33b719b15ad9f))
* expose Security Settings API. ([#46](https://www.github.com/googleapis/nodejs-dialogflow-cx/issues/46)) ([f6460ce](https://www.github.com/googleapis/nodejs-dialogflow-cx/commit/f6460cea16473d1f208eae4bfa3def7cf5583579))
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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]

dialogflow-cx/package.json

@@ -13,7 +13,7 @@
     "test": "c8 mocha --timeout 600000 test/*.js"
   },
   "dependencies": {
-    "@google-cloud/dialogflow-cx": "^2.1.0",
+    "@google-cloud/dialogflow-cx": "^2.2.0",
     "uuid": "^8.3.1"
   },
   "devDependencies": {