chore: release 2.0.6 (#186)

🤖 I have created a release \*beep\* \*boop\* 
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### [2.0.6](https://www.github.com/googleapis/nodejs-cloudbuild/compare/v2.0.5...v2.0.6) (2020-11-25)


### Bug Fixes

* check for fetch on window ([#185](https://www.github.com/googleapis/nodejs-cloudbuild/issues/185)) ([115de71](https://www.github.com/googleapis/nodejs-cloudbuild/commit/115de7141262c119113759aee5ddc141d129b55d))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please).

cloudbuild/package.json

@@ -15,7 +15,7 @@
     "test": "c8 mocha system-test --timeout=800000"
   },
   "dependencies": {
-    "@google-cloud/cloudbuild": "^2.0.5"
+    "@google-cloud/cloudbuild": "^2.0.6"
   },
   "devDependencies": {
     "c8": "^7.0.0",