chore: release 3.0.2 (#254)

🤖 I have created a release \*beep\* \*boop\*
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### [3.0.2](https://www.github.com/googleapis/nodejs-document-ai/compare/v3.0.1...v3.0.2) (2021-08-17)


### Bug Fixes

* **build:** migrate to using main branch ([#253](https://www.github.com/googleapis/nodejs-document-ai/issues/253)) ([ac879c4](https://www.github.com/googleapis/nodejs-document-ai/commit/ac879c425cb75862508527b2cf7cbd34e958684e))
* **deps:** google-gax v2.24.1 ([#257](https://www.github.com/googleapis/nodejs-document-ai/issues/257)) ([4ff6b2d](https://www.github.com/googleapis/nodejs-document-ai/commit/4ff6b2dfa2a5cee97f5dee0690c54f606902a38a))
* Update DocumentUnderstandingService default_host in v1beta2 from a regional endpoint, to non-regional ([#252](https://www.github.com/googleapis/nodejs-document-ai/issues/252)) ([79b8d82](https://www.github.com/googleapis/nodejs-document-ai/commit/79b8d825244748473efcee1d75653aa2b5077055))
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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]

document-ai/snippets/package.json

@@ -13,7 +13,7 @@
     "test": "mocha test/*.js --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/documentai": "^3.0.1",
+    "@google-cloud/documentai": "^3.0.2",
     "@google-cloud/storage": "^5.0.0",
     "p-queue": "^6.6.2",
     "uuid": "^8.3.1"