chore: release 3.1.0 (#570)

🤖 I have created a release \*beep\* \*boop\* 
---
## [3.1.0](https://www.github.com/googleapis/nodejs-dlp/compare/v3.0.6...v3.1.0) (2021-01-09)


### Features

* adds style enumeration ([#569](https://www.github.com/googleapis/nodejs-dlp/issues/569)) ([3c8acf2](https://www.github.com/googleapis/nodejs-dlp/commit/3c8acf24523f2b130abc48bb18927ccac6cb6c3a))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

dlp/package.json

@@ -15,7 +15,7 @@
     "test": "mocha system-test/*.test.js --timeout=600000"
   },
   "dependencies": {
-    "@google-cloud/dlp": "^3.0.6",
+    "@google-cloud/dlp": "^3.1.0",
     "@google-cloud/pubsub": "^2.0.0",
     "mime": "^2.3.1",
     "yargs": "^16.0.0"