docs(node): support "stable"/"preview" release level (#1312) (#581)

Author: gcf-owl-bot[bot]

handwritten/nodejs-logging-bunyan/README.md

@@ -268,6 +268,8 @@ are addressed with the highest priority.
 
 
 
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 More Information: [Google Cloud Platform Launch Stages][launch_stages]
 
 [launch_stages]: https://cloud.google.com/terms/launch-stages