chore: release 3.1.1 (#655)

🤖 I have created a release \*beep\* \*boop\* 
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### [3.1.1](https://www.github.com/googleapis/nodejs-dialogflow/compare/v3.1.0...v3.1.1) (2020-07-23)


### Bug Fixes

* publish missing client config annotations ([#653](https://www.github.com/googleapis/nodejs-dialogflow/issues/653)) ([b368797](https://www.github.com/googleapis/nodejs-dialogflow/commit/b36879723fd3aeab0c158d3ab76a5aa6505498e1))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please).

dialogflow/package.json

@@ -15,7 +15,7 @@
     "test": "mocha system-test --timeout=600000"
   },
   "dependencies": {
-    "@google-cloud/dialogflow": "^3.1.0",
+    "@google-cloud/dialogflow": "^3.1.1",
     "pb-util": "^0.1.0",
     "uuid": "^8.0.0",
     "yargs": "^15.0.0"