DeprecationWarning: Buffer()

When running the API example linked in the docs, there is a deprecation warning being logged.

```[DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.```

Just thought I would point this out, perhaps the API auth example should be updated!

Thanks!