chore: release 3.19.0 (#552)

🤖 I have created a release \*beep\* \*boop\*
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## [3.19.0](https://www.github.com/googleapis/nodejs-asset/compare/v3.18.0...v3.19.0) (2021-09-07)


### Features

* add OSConfigZonalService API Committer: [@jaiminsh](https://www.github.com/jaiminsh) ([#553](https://www.github.com/googleapis/nodejs-asset/issues/553)) ([1ab2458](https://www.github.com/googleapis/nodejs-asset/commit/1ab2458b63ebe46b8aa8edbd2b1837e793d531f1))
* Release of relationships in v1, Add content type Relationship to support relationship search Committer: yuwangyw@ ([#551](https://www.github.com/googleapis/nodejs-asset/issues/551)) ([56526b0](https://www.github.com/googleapis/nodejs-asset/commit/56526b02d14d15fd6fc469cd614bff9098f3789b))
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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]

asset/snippets/package.json

@@ -15,7 +15,7 @@
     "test": "mocha --timeout 180000"
   },
   "dependencies": {
-    "@google-cloud/asset": "^3.18.0",
+    "@google-cloud/asset": "^3.19.0",
     "@google-cloud/bigquery": "^5.5.0",
     "@google-cloud/compute": "^2.0.0",
     "@google-cloud/storage": "^5.0.0",