chore: release 3.4.0 (#563)

🤖 I have created a release \*beep\* \*boop\*
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## [3.4.0](https://www.github.com/googleapis/nodejs-text-to-speech/compare/v3.3.1...v3.4.0) (2021-12-09)


### Features

* adds support for MULAW and ALAW audio encoding ([#565](https://www.github.com/googleapis/nodejs-text-to-speech/issues/565)) ([cf7cb74](https://www.github.com/googleapis/nodejs-text-to-speech/commit/cf7cb74655a5bd1cfc13b670a4b620ac8dd78138))
* update v1beta1 proto ([#562](https://www.github.com/googleapis/nodejs-text-to-speech/issues/562)) ([0d78e6c](https://www.github.com/googleapis/nodejs-text-to-speech/commit/0d78e6c87e51c040c5f35064b53f96d1353f93b9))
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Author: release-please[bot]

texttospeech/package.json

@@ -14,7 +14,7 @@
     "test": "mocha --timeout=60000"
   },
   "dependencies": {
-    "@google-cloud/text-to-speech": "^3.3.1",
+    "@google-cloud/text-to-speech": "^3.4.0",
     "yargs": "^16.0.0"
   },
   "devDependencies": {