chore: release 2.4.0 (#479)

🤖 I have created a release \*beep\* \*boop\* 
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## [2.4.0](https://www.github.com/googleapis/nodejs-automl/compare/v2.3.1...v2.4.0) (2021-01-09)


### Features

* adds style enumeration ([#478](https://www.github.com/googleapis/nodejs-automl/issues/478)) ([1eddaf2](https://www.github.com/googleapis/nodejs-automl/commit/1eddaf2618a1e65d3f54faba4e1ef37abcdab916))
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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).

automl/package.json

@@ -16,7 +16,7 @@
     "!test/"
   ],
   "dependencies": {
-    "@google-cloud/automl": "^2.3.1",
+    "@google-cloud/automl": "^2.4.0",
     "csv": "^5.1.3",
     "mathjs": "^8.0.0",
     "yargs": "^16.0.0"