chore: release 2.2.2 (#132)

🤖 I have created a release \*beep\* \*boop\* 
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### [2.2.2](https://www.github.com/googleapis/nodejs-document-ai/compare/v2.2.1...v2.2.2) (2020-12-01)


### Bug Fixes

* **browser:** check for fetch on window ([#131](https://www.github.com/googleapis/nodejs-document-ai/issues/131)) ([b7b016e](https://www.github.com/googleapis/nodejs-document-ai/commit/b7b016ed8c45c4da57cbe3eb652cd6b27f3be0f0))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please).

Author: release-please[bot]

document-ai/package.json

@@ -13,7 +13,7 @@
     "test": "mocha test/*.js --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/documentai": "^2.2.1",
+    "@google-cloud/documentai": "^2.2.2",
     "@google-cloud/storage": "^5.0.0",
     "p-queue": "^6.6.2",
     "uuid": "^8.3.1"