chore(main): release 1.18.0 (#279)

🤖 I have created a release *beep* *boop*
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## [1.18.0](googleapis/nodejs-ai-platform@v1.17.0...v1.18.0) (2022-03-17)


### Features

* add `service_account` to `BatchPredictionJob` in aiplatform `v1beta1` `batch_prediction_job.proto` ([#278](googleapis/nodejs-ai-platform#278)) ([1f05428](googleapis/nodejs-ai-platform@1f05428))

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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]

ai-platform/snippets/package.json

@@ -13,7 +13,7 @@
     "test": "mocha --timeout 1200000 test/*.js"
   },
   "dependencies": {
-    "@google-cloud/aiplatform": "^1.17.0",
+    "@google-cloud/aiplatform": "^1.18.0",
     "@google-cloud/storage": "^5.5.0"
   },
   "devDependencies": {