chore: release 3.1.0 (#106)

🤖 I have created a release \*beep\* \*boop\* 
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## [3.1.0](https://www.github.com/googleapis/nodejs-service-directory/compare/v3.0.0...v3.1.0) (2021-01-09)


### Features

* adds style enumeration ([#105](https://www.github.com/googleapis/nodejs-service-directory/issues/105)) ([0807e17](https://www.github.com/googleapis/nodejs-service-directory/commit/0807e17411d6608d0cbad33a417bed25c883bcb4))


### Bug Fixes

* **deps:** update dependency json-schema to ^0.3.0 ([#102](https://www.github.com/googleapis/nodejs-service-directory/issues/102)) ([e7cb54b](https://www.github.com/googleapis/nodejs-service-directory/commit/e7cb54bac1f0101f47b10d9244487ae91ca4239d))
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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).

service-directory/snippets/package.json

@@ -13,7 +13,7 @@
     "test": "c8 mocha --timeout 600000 test/*.js"
   },
   "dependencies": {
-    "@google-cloud/service-directory": "^3.0.0",
+    "@google-cloud/service-directory": "^3.1.0",
     "eslint": "^7.0.0",
     "json-schema": "^0.3.0",
     "uuid": "^8.0.0"