chore: release 4.1.5 (#675)

🤖 I have created a release \*beep\* \*boop\* 
---
### [4.1.5](https://www.github.com/googleapis/nodejs-speech/compare/v4.1.4...v4.1.5) (2020-12-02)


### Bug Fixes

* **browser:** check for fetch on window ([6378dc1](https://www.github.com/googleapis/nodejs-speech/commit/6378dc193da2f792645ed0ec221c9a3495264486))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please).

speech/package.json

@@ -15,7 +15,7 @@
     "test": "c8 mocha system-test --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/speech": "^4.1.4",
+    "@google-cloud/speech": "^4.1.5",
     "@google-cloud/storage": "^5.0.0",
     "chalk": "^4.0.0",
     "node-record-lpcm16": "^1.0.1",