chore: release 3.1.3 (#624)

🤖 I have created a release \*beep\* \*boop\*
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### [3.1.3](https://www.github.com/googleapis/nodejs-dlp/compare/v3.1.2...v3.1.3) (2021-06-22)


### Bug Fixes

* make request optional in all cases ([#623](https://www.github.com/googleapis/nodejs-dlp/issues/623)) ([77f45fb](https://www.github.com/googleapis/nodejs-dlp/commit/77f45fbcd1481079cc8f1bd10d5637da24405bce))
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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]

dlp/package.json

@@ -15,7 +15,7 @@
     "test": "mocha system-test/*.test.js --timeout=600000"
   },
   "dependencies": {
-    "@google-cloud/dlp": "^3.1.2",
+    "@google-cloud/dlp": "^3.1.3",
     "@google-cloud/pubsub": "^2.0.0",
     "mime": "^2.3.1",
     "yargs": "^16.0.0"