chore: release 3.1.0 (#637)

🤖 I have created a release \*beep\* \*boop\* 
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## [3.1.0](https://www.github.com/googleapis/nodejs-dialogflow/compare/v3.0.0...v3.1.0) (2020-07-10)


### Features

* adds projectAgentEnvironmentPathTemplate and projectAgentEnvironmentUserSessionContextPathTemplate ([c204d9c](https://www.github.com/googleapis/nodejs-dialogflow/commit/c204d9cd7d9f121404b15783b8da5a451a671748))


### Bug Fixes

* typeo in nodejs .gitattribute ([#639](https://www.github.com/googleapis/nodejs-dialogflow/issues/639)) ([558aad8](https://www.github.com/googleapis/nodejs-dialogflow/commit/558aad81af74888516db9667f4a4e7b56cd3d3ba))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please).

Author: release-please[bot]

dialogflow/package.json

@@ -15,7 +15,7 @@
     "test": "mocha system-test --timeout=600000"
   },
   "dependencies": {
-    "@google-cloud/dialogflow": "^3.0.0",
+    "@google-cloud/dialogflow": "^3.1.0",
     "pb-util": "^0.1.0",
     "uuid": "^8.0.0",
     "yargs": "^15.0.0"