chore: release 4.7.0 (#793)

🤖 I have created a release \*beep\* \*boop\*
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## [4.7.0](https://www.github.com/googleapis/nodejs-speech/compare/v4.6.1...v4.7.0) (2021-08-19)


### Features

* Add transcript normalization ([#792](https://www.github.com/googleapis/nodejs-speech/issues/792)) ([08ed5b5](https://www.github.com/googleapis/nodejs-speech/commit/08ed5b51bda6f158d6c5709a6ca3393aa0c61c3d))
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speech/package.json

@@ -15,7 +15,7 @@
     "test": "c8 mocha system-test --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/speech": "^4.6.1",
+    "@google-cloud/speech": "^4.7.0",
     "@google-cloud/storage": "^5.0.0",
     "chalk": "^4.0.0",
     "node-record-lpcm16": "^1.0.1",